Last updated: February 24, 2025
Experience the captivating weather of Siesta Key, United States, in September, where warm days invite sun-soaked adventures. With a maximum temperature reaching 33°C (92°F) and an average of 28°C (82°F), the climate is perfect for beach outings and outdoor activities. However, be prepared for occasional rainfall, as 171 mm (6.7 in) of precipitation often graces the area over 20 days, creating lush surroundings. The humidity level of 78% adds a tropical touch, making it a quintessential beach destination, where the sun and sea blend harmoniously with the vibrant atmosphere of this stunning locale.
In Siesta Key, September ushers in a warm embrace with minimum temperatures around 22°C (72°F), elevating the monthly average to a cozy 28°C (82°F). As summer comes to a close, the maximum temperatures remain vibrant, peaking at 33°C (92°F), reflecting the lingering heat of the season. This month showcases a gradual cooling trend compared to the steamy highs of July and August, yet it still promises plenty of sunshine and ideal beach weather. With warm ocean waters and clear skies, September remains a splendid time to enjoy the serene beauty and relaxed vibe of Siesta Key.
In Siesta Key, September typically sees a significant amount of precipitation, with 171 mm (6.7 in) of rain falling over 20 days. This marks a decline from the peak rainy months of July and August, where the region experiences its highest rainfall totals of 196 mm (7.7 in) and 213 mm (8.4 in) respectively. Although September's rainfall is lower, it still represents a substantial accumulation, contributing to the lush, tropical landscape of the area. Compared to the preceding summer months, the transition into autumn is marked by slightly fewer rain days, hinting at a shift in weather patterns. Overall, September serves as a bridge between the intense summer rains and the drier spell of fall, maintaining a balance that keeps Siesta Key vibrant and verdant.
In September, Siesta Key experiences a slight uptick in humidity, with levels reaching 78%. This marks a transition from the drier months of July and August, when humidity dipped to 74%. As summer draws to a close, the atmosphere begins to feel a touch more tropical, hinting at the delightful autumn warmth ahead. Throughout the year, humidity levels tend to hover between the low 70s and mid 80s, peaking in the winter months of November and December. This dynamic creates a unique climate that balances between sultry summer vibes and the more comfortable fall conditions, making Siesta Key a year-round destination for beach lovers.
In September, Siesta Key experiences an UV Index of 11, categorized as extreme, which means that sun exposure can lead to skin damage in just 10 minutes. This trend signifies the continuation of high UV levels seen throughout the summer months, with both June and July also reaching the same peak index. Following the slightly lower indexes in August and October, September’s levels remind beachgoers to take precautions against intense sun exposure. As you enjoy the warm, sunny days of early fall, be mindful of your burn time and keep sunscreen handy—protecting your skin should always be a top priority. For more detailed information, check out the Siesta Key UV Index.
UV Risk Categories
As September rolls into Siesta Key, the region continues to bask in a generous 314 hours of sunshine, a delightful close to the summer season. This marks a slight dip from the sun-soaked peaks of May and July, both boasting over 330 hours, yet still showcases the area’s remarkable weather. The golden rays this month offer ample opportunity for beachgoers and outdoor enthusiasts to soak in the vibrant late-summer atmosphere. Interestingly, the consistent trend throughout the year reveals a predominantly sunny disposition, with only November and January falling below 300 hours. Thus, even as summer wanes, September stands out as a brilliant canvas of warmth and light, inviting visitors to relish the last whispers of summer before the cooler months approach.
In Siesta Key, United States, the likelihood of sunny weather shows notable seasonal trends throughout the year. As winter fades, the chance of sunshine increases, peaking in the spring months of April (64%) and March (57%), offering the most favorable weather. However, by the time September rolls around, the likelihood drops to 32%, marking a transition into the fall season. This decline in sunny days is particularly stark when compared to the languid summer months of June (18%) and July (23%), where cloud cover tends to dominate. As summer gives way to autumn, while September doesn’t shine as brightly as earlier months, the chance of sun is still a hopeful 32%, hinting at opportunities for warm beach days before the cooler October begins.
As September rolls in, Siesta Key enjoys a gradual transition in daylight as summer begins to fade. With 12 hours of daylight, the month marks a slight decrease from the sun-soaked days of August, which boasted a full 13 hours. This shift reflects the seasonal rhythm, where the days slowly shorten from the summer peak, yet still offers plenty of sunshine for beachgoers and outdoor enthusiasts. Following the trend established throughout the year, September's daylight prepares the area for the coming months of reduced sunlight, with October offering just 11 hours. Yet, this gentle decline still provides ample opportunity to relish the warm weather and stunning sunsets characteristic of this beautiful coastal paradise.
As summer transitions to autumn, September in Siesta Key experiences a notable decrease in wind speed, averaging just 2.7 m/s (6 mph). This marks the calmest month of the year, following a gradual decline since the peak winds of early spring. With the bustling gusts of 4.5 m/s (10 mph) in February and lingering breezes of 3.4 m/s (8 mph) in June, September's gentle winds create a serene atmosphere perfect for leisurely beach strolls and tranquil evenings. As the year progresses, October brings a slight uptick to 3.5 m/s (8 mph), hinting at the return of more spirited breezes, but for now, the light September winds invite relaxation and reflection in the sun-drenched paradise.
The weather in Siesta Key changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Siesta Key and find detailed weather information for every month.
September and January present strikingly different weather conditions. September boasts warm temperatures, with a minimum of 22°C (72°F) and an average of 28°C (82°F), peaking at 33°C (92°F). However, this month also brings a significant amount of rain, with 171 mm (6.7 in) of precipitation spread over 20 days, accompanied by high humidity at 78%. In contrast, January offers a much cooler climate, featuring a minimum temperature of 1°C (34°F) and an average of 17°C (63°F), while reaching a maximum of 27°C (80°F). Precipitation drops dramatically to 36 mm (1.4 in) over just 4 days, with humidity slightly higher at 82%. For a deeper look at the conditions in January, you can check Siesta Key weather in January.
The weather in September is markedly warmer and more humid than in February. With minimum temperatures around 22°C (72°F) and maximums soaring to 33°C (92°F), September averages 28°C (82°F), accompanied by significant precipitation of 171 mm (6.7 in) over approximately 20 days. In contrast, February offers a much cooler experience, with minimum temperatures dipping to 6°C (44°F) and an average of 20°C (67°F), reaching a maximum of 28°C (82°F). Precipitation in February is significantly lower at 41 mm (1.6 in) over just 4 days, while the humidity remains high at 82%. For more detailed insights about the weather during this time, check out Siesta Key weather in February.
September and March present a striking contrast in weather patterns. September features warmer temperatures, with a minimum of 22°C (72°F) and an average reaching 28°C (82°F), peaking at a hot 33°C (92°F). In stark contrast, March starts off cooler, with temperatures ranging from a minimum of 7°C (45°F) to a maximum of 28°C (83°F), and an average of 21°C (69°F). Additionally, September brings a much higher level of precipitation, with 171 mm (6.7 in) over about 20 days, while March sees significantly less rain at just 23 mm (0.9 in) across 3 days. Both months maintain high humidity levels, but the difference in temperature and precipitation makes for distinctly different experiences. For more detailed information, you can check Siesta Key weather in March.
Comparing the weather in September and April reveals distinct differences in temperature and precipitation. In September, the temperatures range from a minimum of 22°C (72°F) to a maximum of 33°C (92°F), with an average of 28°C (82°F). This month also experiences considerable rainfall, with 171 mm (6.7 in) of precipitation occurring over 20 days, resulting in a perpetually humid atmosphere at 78%.
In contrast, April presents milder conditions, with a temperature range from a cooler minimum of 11°C (52°F) to a maximum of 30°C (86°F) and an average temperature of 23°C (74°F). Rainfall is significantly lower, at just 52 mm (2.0 in) spread across 7 days, while maintaining the same humidity level of 78%.
For a more detailed look at April's climate, you can visit Siesta Key weather in April.
In comparing the weather of September and May, it's evident that September tends to be warmer overall, with average temperatures reaching 28°C (82°F) and maxima of 33°C (92°F), while May has lower averages at 25°C (78°F) and maxima of 32°C (90°F). September also experiences significantly higher rainfall, with 171 mm (6.7 in) falling over about 20 days, compared to May's 109 mm (4.3 in) over just 12 days. Humidity levels are slightly higher in September at 78% versus 76% in May, which can contribute to a more muggy feel. For a closer look at what to expect during this transition in weather, check out Siesta Key weather in May.
When comparing the weather in September and June, both months exhibit warm temperatures, but there are some notable differences. September has a minimum temperature of 22°C (72°F) and an average of 28°C (82°F), while June starts off slightly warmer with a minimum of 23°C (73°F) and an average of 27°C (81°F). However, the maximum temperatures in both months are quite similar, with September reaching up to 33°C (92°F) and June peaking at 34°C (93°F). In terms of precipitation, September sees a total of 171 mm (6.7 in) over about 20 days, whereas June has slightly higher precipitation at 184 mm (7.3 in) across 22 days. Interestingly, September has a higher humidity level at 78%, compared to June's 75%. For those looking to explore the weather during this time, you can find more details here: Siesta Key weather in June.
In comparing the weather conditions of September and July, both months feature similar average temperatures, with July experiencing slightly warmer minimum temperatures at 24°C (75°F) compared to September's 22°C (72°F). However, both months share an average temperature of 28°C (82°F), and their maximum temperatures are nearly identical at 33°C (91°F for July and 33°C (92°F for September). When it comes to rainfall, July sees a higher total precipitation of 196 mm (7.7 in) over 26 days, while September receives 171 mm (6.7 in) across 20 days, indicating that September tends to have slightly less rainy days. Additionally, September's humidity is slightly higher at 78%, compared to July's 74%. For more information on July weather specifics, you can visit Siesta Key weather in July.
In comparing the weather of September and August, it’s evident that September experiences slightly cooler temperatures, with minimums around 22°C (72°F) compared to August’s 24°C (76°F). Both months share a similar average temperature of 28°C (82°F), but August reaches higher maximums at 34°C (93°F), whereas September maxes out at 33°C (92°F). Precipitation is notably higher in August, with 213 mm (8.4 in) over 26 days, compared to September's 171 mm (6.7 in) over 20 days. Additionally, humidity is marginally greater in September at 78% versus August’s 74%. For more detailed insights on weather conditions, check out Siesta Key weather in August.
In September, the weather is notably warmer and more humid, with average temperatures reaching 28°C (82°F) and maximums hitting 33°C (92°F). The month also experiences considerable rainfall, totaling 171 mm (6.7 in) over 20 days, creating a lush environment. In contrast, October sees a drop in minimum temperatures to 12°C (54°F) and an overall average of 26°C (79°F). While it remains warm, October brings less precipitation, totaling only 67 mm (2.7 in) over just 10 days, making it a drier month. Humidity levels stay relatively stable at 79%, contributing to a comfortable atmosphere. For more detailed information, check out Siesta Key weather in October.
September and November offer contrasting weather patterns. September tends to be much warmer, with average temperatures peaking at around 28°C (82°F) and maximums reaching 33°C (92°F). In this month, precipitation is common, with rain falling on 20 days and totaling 171 mm (6.7 in), while humidity stays high at 78%. In contrast, November brings cooler conditions with an average temperature of 22°C (71°F) and maximums reaching 30°C (85°F). Rain is significantly less frequent, occurring only on 5 days and totaling just 42 mm (1.6 in), with a slightly higher humidity at 82%. For a more detailed look at the weather patterns in November, check out Siesta Key weather in November.
September and December exhibit striking differences in weather patterns. In September, temperatures range from a warm minimum of 22°C (72°F) to a hot maximum of 33°C (92°F), with an average of 28°C (82°F). The month is characterized by significant rainfall, totaling 171 mm (6.7 in) over 20 days, and the humidity is relatively high at 78%. In contrast, December sees much cooler temperatures, with a minimum of 6°C (44°F) and a maximum of 27°C (81°F), averaging 19°C (67°F). Precipitation drops significantly to 60 mm (2.4 in) over just 6 days, while humidity increases slightly to 84%. For more detailed insights on December weather, you can visit Siesta Key weather in December.
As September arrives in Siesta Key, the weather showcases a unique blend that sets it apart from the rest of the year. With an average temperature of 28°C (82°F), it remains pleasantly warm, though it also marks the transition into a wetter season, evidenced by approximately 20 days of rain and a significant increase in humidity, hovering around 78%. This combination not only elevates evening comfort levels but also nourishes the vibrant natural surroundings. While the heat peaks at 33°C (92°F), the space between summer and fall invites both sunny beach days and refreshing tropical showers. For a deeper understanding of the region's climate trends, check out Siesta Key Climate.