9+ Best Times for Disney World: Sept Weather Guide


9+ Best Times for Disney World: Sept Weather Guide

Central Florida in September sometimes experiences the waning days of summer season’s warmth and humidity, coupled with the rising chance of afternoon thunderstorms and the beginning of hurricane season. Temperatures typically attain the low 90s Fahrenheit (round 32-34 levels Celsius) with excessive humidity ranges, making it really feel even hotter. Rainfall is frequent, typically occurring in brief, heavy bursts through the afternoon or night.

Understanding the everyday weather conditions of this era is essential for guests planning a visit to the Walt Disney World Resort. Being ready for each scorching, humid days and potential rain showers permits company to pack appropriately, schedule out of doors actions strategically, and make knowledgeable selections about park itineraries. This consciousness can considerably improve consolation and delight, maximizing trip time. Traditionally, September has seen fluctuations in temperature and rainfall, reinforcing the significance of checking forecasts nearer to the journey date.

The next sections will delve deeper into particular features of early autumn circumstances in Central Florida, providing sensible recommendation on clothes decisions, park methods, and contingency plans for inclement climate. Additional dialogue will cowl historic climate developments and common rainfall statistics to equip guests with a complete understanding of what to anticipate.

1. Warmth and Humidity

Warmth and humidity are defining traits of September climate in Central Florida, considerably impacting customer expertise at Walt Disney World. Excessive temperatures, often within the low 90s Fahrenheit (low 30s Celsius), mix with elevated humidity ranges to create a typically exceeding the precise air temperature. This may result in warmth exhaustion or warmth stroke if precautions should not taken. The humid air additionally reduces the physique’s skill to chill itself via perspiration, additional exacerbating the consequences of warmth.

The mixture of warmth and humidity necessitates particular methods for guests. Staying hydrated by consuming loads of water all through the day is essential. Searching for air-conditioned areas for normal breaks supplies reduction from the oppressive warmth. Selecting light-weight, breathable clothes helps regulate physique temperature and decrease discomfort. Making use of sunscreen often is crucial, as the extreme Florida solar may cause sunburn even on cloudy days. Understanding the impression of warmth and humidity permits guests to proactively handle their consolation and well-being, enabling them to completely benefit from the park expertise.

Efficiently navigating the warmth and humidity requires proactive planning and adaptation. Scheduling out of doors actions for cooler components of the day, equivalent to early morning or late night, can decrease publicity to probably the most intense circumstances. Using obtainable transportation choices throughout the resort can scale back strolling time and bodily exertion. Recognizing the indicators of heat-related sickness is essential, enabling immediate motion and stopping critical well being penalties. By acknowledging and making ready for the prevalent warmth and humidity, guests can mitigate potential discomfort and guarantee a constructive expertise.

2. Afternoon Thunderstorms

Afternoon thunderstorms are a frequent incidence throughout September in Central Florida, considerably impacting actions at Walt Disney World. These storms, typically characterised by heavy rain, lightning, and powerful winds, sometimes develop through the hottest a part of the day and might disrupt out of doors sights, parades, and different scheduled occasions. Understanding their nature and potential impression is essential for guests planning a September journey.

  • Growth and Traits

    Afternoon thunderstorms type because of the collision of heat, moist air with cooler, drier air lots. The extraordinary Florida solar heats the bottom, inflicting heat air to rise quickly and create unstable atmospheric circumstances. These storms typically deliver heavy downpours, frequent lightning strikes, and sometimes, sturdy wind gusts. Their localized nature means they will impression one space of the resort whereas leaving others untouched.

  • Affect on Park Operations

    Out of doors rides and sights are sometimes quickly closed throughout thunderstorms as a result of security issues associated to lightning. Parades and out of doors reveals could also be delayed or canceled. Friends typically search shelter in indoor sights, outlets, or eating places, resulting in elevated crowding in these areas. Understanding these operational changes permits guests to anticipate potential disruptions and regulate their plans accordingly.

  • Security Precautions

    Heeding warnings from park officers is paramount throughout thunderstorms. Searching for designated shelter areas promptly and remaining indoors till the storm passes minimizes danger. Avoiding open areas and our bodies of water throughout lightning exercise is crucial. Staying knowledgeable about climate updates via the resort’s app or web site permits guests to make knowledgeable selections and prioritize security.

  • Planning and Contingency

    Flexibility is essential when planning park visits throughout September. Having various indoor actions in thoughts permits company to take advantage of their time even throughout inclement climate. Packing rain gear, equivalent to ponchos or small umbrellas, helps mitigate the impression of sudden showers. Checking climate forecasts frequently and adjusting park itineraries primarily based on predictions permits for a extra seamless and pleasurable expertise.

The prevalence of afternoon thunderstorms in September underscores the significance of preparedness and adaptableness. By understanding their formation, potential impression, and obligatory security precautions, guests can navigate these climate occasions successfully and decrease disruptions to their Walt Disney World expertise. Being ready permits company to concentrate on having fun with the magic of the resort, even amidst the occasional afternoon bathe.

3. Hurricane Season’s Begin

September marks the height of hurricane season within the Atlantic, immediately influencing climate patterns at Walt Disney World. Whereas direct hurricane strikes on the Orlando space are comparatively uncommon, the elevated probability of tropical storms and depressions throughout this era brings elevated dangers of heavy rainfall, sturdy winds, and potential flooding. These circumstances can considerably impression park operations, resulting in journey closures, parade cancellations, and disruptions to transportation companies. Understanding this seasonal affect is important for guests planning September journeys.

The presence of a tropical system, even when it would not make landfall close to Orlando, can dramatically alter native climate. Outer rain bands can deliver sustained intervals of heavy rainfall, resulting in localized flooding and impacting out of doors actions. Robust winds related to these programs may cause non permanent closures of out of doors sights and reveals. Moreover, the general atmospheric instability generated by close by tropical programs can exacerbate the formation of afternoon thunderstorms, a typical incidence in September, additional rising the probability of weather-related disruptions. Historic examples, equivalent to Hurricane Irma in 2017, exhibit the potential impression of those storms, even when the attention of the hurricane stays distant from the resort itself.

Planning a September go to requires acknowledging the potential impression of hurricane season. Monitoring climate forecasts intently within the days main as much as and through the journey permits guests to anticipate potential disruptions and regulate itineraries accordingly. Familiarizing oneself with the resort’s hurricane insurance policies, together with cancellation procedures and refund choices, supplies peace of thoughts. Packing acceptable rain gear and contemplating journey insurance coverage are additional sensible steps. Whereas the opportunity of a hurricane impacting a visit exists, understanding the related dangers and taking acceptable precautions permits guests to make knowledgeable selections and mitigate potential disruptions, guaranteeing a safer and extra pleasurable expertise.

4. Common Excessive Close to 90F (32C)

A mean excessive temperature close to 90F (32C) is a defining attribute of September climate in Disney World. This persistent warmth considerably influences customer expertise, impacting clothes decisions, exercise planning, and general consolation ranges. Understanding its implications is essential for successfully navigating the parks throughout this time.

  • Affect on Visitor Consolation

    Sustained temperatures close to 90F, mixed with excessive humidity typical of Central Florida, can result in warmth exhaustion or heatstroke if precautions should not taken. This necessitates frequent hydration, breaks in air-conditioned areas, and acceptable apparel. Ignoring the impression of excessive temperatures can considerably detract from the enjoyment of park actions.

  • Affect on Park Operations

    The extraordinary warmth can affect park operations. Water parks turn out to be notably standard, whereas out of doors queues for sights can turn out to be uncomfortable. Trip closures as a result of technical difficulties associated to warmth are additionally doable, although much less frequent. Park administration typically implements measures like misting followers and elevated water distribution to mitigate the consequences of excessive temperatures on company.

  • Exercise Planning Issues

    Guests ought to schedule strenuous actions for cooler components of the day, equivalent to early morning or night. Noon breaks in air-conditioned environments turn out to be important for sustaining consolation and stopping heat-related diseases. Selecting indoor sights or reveals through the hottest hours supplies respite from the solar and permits for continued enjoyment of the park.

  • Interaction with Different Climate Elements

    The excessive common temperature interacts with different September climate traits, equivalent to afternoon thunderstorms and humidity, to create a posh setting. Warmth can exacerbate the sensation of humidity, making circumstances really feel much more oppressive. The warmth additionally contributes to the event of afternoon thunderstorms, which, whereas providing non permanent reduction from excessive temperatures, can disrupt deliberate actions.

The constant common excessive close to 90F (32C) in September underscores the significance of warmth preparedness for guests to Disney World. Understanding its affect on consolation ranges, park operations, and general expertise permits for knowledgeable planning and proactive methods to mitigate the challenges posed by the warmth. By acknowledging this defining climate attribute, guests can guarantee a extra pleasurable and protected expertise within the parks.

5. Excessive Rainfall Potential

Excessive rainfall potential is a major factor of September climate in Disney World, stemming from a confluence of meteorological components. The placement’s subtropical local weather, coupled with the height of hurricane season within the Atlantic, contributes to elevated atmospheric moisture and instability. This instability, mixed with daytime heating, fuels the event of convective thunderstorms, typically producing heavy downpours. Moreover, the presence of tropical programs, even when circuitously impacting Orlando, can enhance rainfall via related rain bands. This mix of things leads to September being one of many wettest months of the yr for the area.

The sensible implications of excessive rainfall potential for guests are substantial. Sudden downpours can disrupt out of doors actions, resulting in journey closures and parade cancellations. Heavy rainfall can even result in localized flooding in sure areas of the resort, impacting accessibility and transportation. As an illustration, the 2022 hurricane season noticed a number of days of heavy rainfall in September, impacting park operations and requiring company to hunt shelter. Understanding this facet of September climate permits guests to arrange adequately, packing rain gear, growing various indoor exercise plans, and monitoring climate forecasts diligently.

Successfully navigating September in Disney World necessitates acknowledging the excessive rainfall potential. This consciousness empowers guests to mitigate disruptions via proactive planning and knowledgeable decision-making. Packing acceptable apparel, equivalent to ponchos and waterproof footwear, minimizes discomfort throughout downpours. Having backup plans for indoor actions ensures continued enjoyment even throughout inclement climate. Staying up to date on climate forecasts via dependable sources allows real-time changes to itineraries. By recognizing and making ready for the probability of rain, guests can maximize their expertise regardless of the inherent variability of September climate.

6. Humid Circumstances Prevalent

Prevalent humidity is a defining attribute of September climate in Disney World, considerably impacting customer consolation and expertise. This excessive humidity outcomes from the area’s subtropical local weather, characterised by heat, moist air lots originating from the Gulf of Mexico and the Atlantic Ocean. September’s place inside hurricane season additional exacerbates humidity ranges, as tropical programs, even these circuitously impacting Orlando, enhance atmospheric moisture content material. This mix of things creates an setting the place humidity ranges constantly stay excessive, typically exceeding 90%. This pervasive humidity considerably influences perceived temperature, making even reasonably heat temperatures really feel significantly hotter.

The sensible implications of excessive humidity for guests are substantial. Perspiration turns into much less efficient at cooling the physique in humid circumstances, rising the danger of heat-related diseases equivalent to warmth exhaustion and heatstroke. This necessitates elevated vigilance concerning hydration and looking for air-conditioned areas for normal breaks. Moreover, excessive humidity can exacerbate pre-existing respiratory circumstances, requiring guests with such circumstances to take further precautions. For instance, people with bronchial asthma could discover it helpful to hold their inhalers readily accessible and restrict strenuous exercise during times of peak humidity. The mixture of excessive temperatures and excessive humidity creates a novel setting demanding particular preparation and adaptation methods.

Understanding the prevalence of humid circumstances throughout September in Disney World is crucial for customer preparedness and well-being. Acknowledging the impression of humidity on perceived temperature and the physique’s cooling mechanisms permits for knowledgeable selections concerning clothes decisions, exercise scheduling, and hydration methods. This consciousness empowers guests to proactively handle their consolation ranges and decrease the danger of heat-related well being points. Finally, recognizing humidity as a key part of September climate allows guests to benefit from the Disney World expertise totally whereas prioritizing their well being and security.

7. Sudden Downpours

Sudden downpours are an indicator of September climate in Disney World, posing important implications for customer expertise and park operations. Pushed by the area’s subtropical local weather, amplified by the height of hurricane season, and exacerbated by daytime heating, these intense, localized rain occasions can disrupt deliberate actions and require adaptive methods. Understanding their traits and potential impression is essential for navigating the parks successfully throughout this time.

  • Predictability and Depth

    Sudden downpours are sometimes characterised by their speedy onset and unpredictable nature. Clear skies can rapidly transition to heavy rainfall inside minutes, making advance preparation important. These downpours may be intensely heavy, resulting in speedy accumulation of water and localized flooding. The depth can differ considerably, starting from temporary, heavy showers to sustained intervals of torrential rain. This variability necessitates versatile itinerary planning and a willingness to regulate plans on brief discover.

  • Affect on Park Operations and Visitor Expertise

    Sudden downpours often set off operational modifications inside Disney World. Out of doors rides and sights are sometimes quickly closed as a result of security issues associated to lightning and heavy rain. Parades and out of doors reveals are sometimes delayed or canceled. The inflow of company looking for shelter indoors can result in elevated crowding in outlets, eating places, and indoor sights. These disruptions can considerably impression deliberate itineraries and require company to adapt rapidly.

  • Security Issues and Preparedness Methods

    Security is paramount throughout sudden downpours. Heeding warnings from park officers and looking for designated shelter areas promptly are essential. Remaining indoors till the storm passes minimizes publicity to lightning strikes and heavy rainfall. Sporting acceptable rain gear, equivalent to ponchos or waterproof jackets, helps mitigate discomfort. Having readily accessible waterproof baggage for electronics and different delicate objects protects towards water injury. Preparedness permits guests to climate these occasions safely and decrease inconvenience.

  • Length and Restoration

    Whereas typically intense, sudden downpours are sometimes comparatively short-lived, lasting from a couple of minutes to an hour or two. Nonetheless, the impression on park operations can prolong past the period of the rainfall itself. Trip closures could persist till security checks are accomplished and standing water is cleared. Parades and reveals could also be canceled altogether if the disruption is important. Understanding this potential for prolonged impression permits company to regulate expectations and formulate various plans.

The frequency of sudden downpours throughout September in Disney World reinforces the significance of preparedness and adaptableness. By recognizing their traits, potential impression, and related security concerns, guests can navigate these climate occasions successfully and decrease disruptions to their park expertise. This consciousness permits company to take care of a way of enjoyment and take advantage of their go to, even amidst the unpredictable nature of September climate.

8. Tropical Storm Risk

September coincides with peak hurricane season within the Atlantic, presenting a tangible tropical storm menace to the Disney World space. Whereas direct hurricane impacts are much less frequent, the probability of a tropical storm or melancholy influencing Central Florida climate will increase considerably throughout this month. This potential affect necessitates cautious consideration and preparedness from guests planning September journeys.

  • Elevated Rainfall and Flooding

    Tropical programs, even these not making direct landfall, can deliver substantial rainfall to the area. Outer rain bands typically produce extended intervals of heavy rain, resulting in localized flooding throughout the resort and surrounding areas. This may disrupt transportation, restrict entry to sure park areas, and impression out of doors actions. The elevated rainfall can even exacerbate current drainage challenges throughout the resort, additional rising the danger of flooding.

  • Robust Winds and Operational Impacts

    Tropical storms and depressions are related to sturdy winds, which might impression park operations considerably. Out of doors rides and sights are sometimes closed when wind speeds exceed established security thresholds. Parades and out of doors reveals are additionally vulnerable to cancellation as a result of excessive winds. These closures can disrupt deliberate itineraries and restrict obtainable leisure choices for guests.

  • Journey Disruptions and Security Issues

    The specter of a tropical storm can result in journey disruptions, together with flight cancellations and delays. Friends arriving or departing throughout a tropical storm could expertise important inconvenience and require versatile journey preparations. Moreover, sturdy winds and heavy rainfall can create hazardous circumstances throughout the resort, requiring guests to train warning and cling to security pointers issued by park officers.

  • Park Insurance policies and Contingency Planning

    Disney World has established procedures for dealing with extreme climate occasions, together with tropical storms and hurricanes. Familiarizing oneself with these insurance policies, which can embrace park closures, modified working hours, and cancellation procedures, is essential for guests planning September journeys. Creating contingency plans, equivalent to various indoor actions and versatile journey preparations, permits company to adapt to altering circumstances and decrease potential disruptions.

The tropical storm menace inherent in September climate at Disney World underscores the significance of preparedness and knowledgeable decision-making. Monitoring climate forecasts intently, understanding park insurance policies associated to extreme climate, and growing versatile plans allow guests to navigate this potential problem successfully. By acknowledging and making ready for the opportunity of a tropical system influencing their journey, company can mitigate potential disruptions and guarantee a safer and extra pleasurable expertise.

9. Variable Climate Patterns

Variable climate patterns are a defining attribute of September in Disney World, presenting each challenges and alternatives for guests. This variability stems from the convergence of a number of meteorological components, together with the waning days of summer season’s warmth and humidity, the rising affect of Atlantic hurricane season, and the transition into autumnal climate patterns. Understanding this inherent variability is essential for successfully planning and navigating a September go to.

  • Speedy Temperature Fluctuations

    Temperatures throughout September can fluctuate considerably all through a single day. Whereas daytime highs typically attain the low 90s Fahrenheit (low 30s Celsius), in a single day lows can dip into the 70s Fahrenheit (low 20s Celsius). This vast temperature vary necessitates adaptable clothes methods, together with layers that may be added or eliminated as wanted. A cool morning could transition to a scorching afternoon adopted by a snug night, requiring guests to regulate their apparel accordingly.

  • Unpredictable Precipitation

    Rainfall in September is characterised by its unpredictable nature. Whereas some days could stay fully dry, others could expertise intense afternoon thunderstorms or persistent showers related to tropical programs. This variability requires guests to be ready for each dry and moist circumstances, packing rain gear equivalent to ponchos or umbrellas and having various indoor exercise plans. The localized nature of thunderstorms additional complicates predictability, as one space of the resort could expertise heavy rain whereas one other stays dry.

  • Shifting Humidity Ranges

    Humidity ranges in September can even exhibit important variability. Whereas usually excessive, humidity can fluctuate relying on prevailing wind patterns and the presence of close by climate programs. Greater humidity exacerbates the sensation of warmth, rising the danger of heat-related diseases. Decrease humidity, whereas providing non permanent reduction from oppressive circumstances, can even enhance the danger of sunburn as a result of elevated photo voltaic radiation. Monitoring humidity ranges and adjusting hydration and solar safety methods accordingly is crucial.

  • Affect of Tropical Techniques

    The proximity and depth of tropical programs within the Atlantic considerably affect September climate patterns in Disney World. Whereas direct hurricane strikes are uncommon, the outer bands of tropical storms and depressions can deliver intervals of heavy rainfall and powerful winds, disrupting park operations and impacting customer actions. Even distant tropical programs can affect native climate patterns, rising atmospheric instability and contributing to the formation of thunderstorms. Monitoring tropical storm forecasts and understanding their potential impression is essential for September guests.

The inherent variability of September climate in Disney World underscores the significance of flexibility and preparedness. Packing adaptable clothes, having various exercise plans, and staying knowledgeable about climate forecasts permit guests to navigate these fluctuations successfully and maximize their enjoyment of the parks. By acknowledging and making ready for this variability, company can mitigate potential disruptions and create a extra fulfilling Disney World expertise.

Incessantly Requested Questions on September Climate in Disney World

This part addresses frequent inquiries concerning climate circumstances at Walt Disney World throughout September, offering concise and informative responses to facilitate customer preparedness and knowledgeable decision-making.

Query 1: How possible is hurricane disruption throughout a September go to?

Whereas a direct hurricane impression is statistically much less possible, the elevated likelihood of tropical storms and depressions throughout September necessitates consciousness and preparation. Monitoring forecasts intently and understanding park procedures for extreme climate are essential.

Query 2: What are typical daytime temperatures and humidity ranges?

Daytime temperatures sometimes attain the low 90s Fahrenheit (low 30s Celsius) with excessive humidity ranges, typically exceeding 90%, making a warmth index considerably greater than the precise air temperature.

Query 3: How typically does it rain in September, and what’s the nature of the rainfall?

Rainfall is frequent in September, typically occurring as temporary, heavy afternoon thunderstorms. Extended intervals of rain are additionally doable, notably if a tropical system is influencing regional climate.

Query 4: What sort of clothes is advisable for a September journey?

Light-weight, breathable clothes is crucial for managing warmth and humidity. Rain gear, together with a poncho or small umbrella, is very advisable. Snug strolling sneakers are essential, and a light-weight jacket could also be wanted for cooler evenings.

Query 5: How would possibly climate impression park operations and scheduled occasions?

Out of doors rides, sights, parades, and reveals are topic to non permanent closure or cancellation as a result of heavy rain, sturdy winds, or lightning. Indoor sights could expertise elevated crowding throughout inclement climate.

Query 6: What sources can be found for staying up to date on climate circumstances throughout a go to?

Dependable climate forecasts can be found via numerous sources, together with the Walt Disney World Resort app, native information channels, and the Nationwide Climate Service. Park officers additionally present updates and security directions throughout extreme climate occasions.

Consciousness of the potential climate challenges throughout September empowers guests to make knowledgeable decisions and revel in their expertise totally. Proactive planning, versatile itineraries, and acceptable apparel are key to navigating this distinctive time of yr.

The following part provides detailed packing suggestions particularly tailor-made to September circumstances, enabling guests to arrange adequately and mitigate potential weather-related disruptions.

Ideas for Navigating September Climate in Disney World

Efficiently navigating the distinctive climate circumstances of September in Disney World requires proactive planning and adaptation. The following tips supply sensible steering for maximizing consolation and minimizing potential disruptions.

Tip 1: Hydrate Persistently: Sustaining satisfactory hydration is essential within the Florida warmth and humidity. Carry a reusable water bottle and refill it all through the day. Make the most of free water cups obtainable at quick-service eating places.

Tip 2: Costume Strategically: Go for light-weight, breathable materials to handle warmth and humidity. Pack rain gear, together with a poncho or small umbrella, for sudden downpours. Snug, waterproof strolling sneakers are important. A light-weight jacket or sweater could also be wanted for cooler evenings.

Tip 3: Schedule Indoor Actions: Plan indoor actions, equivalent to reveals, reveals, and eating experiences, for the most well liked components of the day, particularly throughout peak afternoon thunderstorm hours. This supplies respite from the warmth and rain whereas maximizing park time.

Tip 4: Monitor Climate Forecasts: Keep knowledgeable about climate predictions utilizing dependable sources just like the Disney World app or native information channels. Alter day by day itineraries primarily based on forecast data to reduce disruption and maximize out of doors enjoyment.

Tip 5: Pack Cooling Equipment: Take into account packing cooling towels, small handheld followers, or misting bottles to assist handle warmth and humidity. These moveable options supply rapid reduction from excessive temperatures, notably whereas ready in out of doors queues.

Tip 6: Make the most of Resort Transportation: Benefit from Disney’s transportation system to reduce strolling time, particularly through the hottest components of the day. Buses, monorails, and boats present handy and air-conditioned journey between parks and resorts.

Tip 7: Perceive Park Insurance policies: Familiarize oneself with Disney’s insurance policies concerning extreme climate, together with journey closures, parade cancellations, and refund choices. This data permits for knowledgeable decision-making and proactive responses to altering climate circumstances.

Tip 8: Take into account Journey Insurance coverage: Journey insurance coverage provides monetary safety towards unexpected circumstances, together with weather-related disruptions or journey cancellations as a result of hurricanes or tropical storms. Consider the advantages and protection choices to find out suitability for particular person wants.

By implementing these methods, guests can mitigate potential weather-related challenges and maximize enjoyment of the Disney World expertise throughout September. Proactive planning and knowledgeable decision-making are key to navigating this distinctive time of yr.

The next conclusion summarizes key takeaways and reinforces the significance of understanding September’s climate dynamics when planning a Disney World trip.

September Climate in Disney World

September climate in Disney World presents a novel set of circumstances for guests. Characterised by warmth, humidity, and the potential for each afternoon thunderstorms and tropical storm affect, this era requires cautious planning and adaptation. Understanding the everyday temperature vary, excessive probability of rainfall, and potential impression on park operations empowers guests to make knowledgeable selections concerning apparel, itinerary planning, and contingency methods. Consciousness of historic climate developments and the dynamic nature of hurricane season additional enhances preparedness.

Efficiently navigating September in Disney World hinges on proactive planning and a versatile method. Using obtainable sources, equivalent to dependable climate forecasts and park-provided data, permits guests to regulate plans dynamically and mitigate potential disruptions. Prioritizing hydration, dressing appropriately, and scheduling indoor actions throughout peak warmth or rainfall contribute considerably to consolation and delight. Finally, knowledgeable preparation ensures a satisfying and memorable expertise regardless of the inherent variability of September climate.