Key West (FL)
September
Weather in Key West, Florida for September 2026
Your guide to Key West weather in September - trends and predictions
Until now, September 2026 in Key West has been nearly identical to the historical average, with a temperature of 30.3 °F (showing only a slight deviation of 0.3 °F).
The forecast for the next days in Key West predicts temperatures to be around 30 °F, close to the historical average.
In general, the average temperature in Key West at the beginning of September is 30 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 29.3 °F by the end of September.
Key West experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 267.4 mm.
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Temperatures
Rain 🌧️
More
3
Dry days
27
Rainy days
0
Snow days
29°/28°
Temperatures
23 km/h
Avg max wind
76 %
Avg humidity
Key West Weather September
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Temperatures trend during September in Key West
See the weather trend as well as the moving average line
September weather in Key West day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 30° /28° | 21.3 mm | 7 | |
| Sept. 2 |  Thundery outbreaks possible | 30° /28° | 20.5 mm | 6 | |
| Sept. 3 |  Light rain shower | 30° /28° | 14.3 mm | 8 | |
| Sept. 4 |  Moderate or heavy rain with thunder | 30° /27° | 21.2 mm | 7 | |
| Sept. 5 | Patchy rain possible | 30° /27° | 11.8 mm | 5 | |
| Sept. 6 |  Light drizzle | 30° /27° | 11.3 mm | 6 | |
| Sept. 7 |  Cloudy | 30° /27° | 34.7 mm | 5 | |
| Sept. 8 | Sunny | 30° /27° | 6.1 mm | 6 | |
| Sept. 9 | Patchy rain possible | 30° /27° | 3 mm | 6 | |
| Sept. 10 | Patchy rain possible | 31° /28° | 1.2 mm | 9.8 | |
| Sept. 11 | Patchy rain possible | 31° /30° | 0.6 mm | 9.7 | |
| Sept. 12 | Patchy rain possible | 30° /30° | 2.2 mm | 10.1 | |
| Sept. 13 |  Overcast | 30° /28° | 5.8 mm | 10.1 | |
| Sept. 14 | Sunny | 30° /30° | 2.3 mm | 8 | |
| Sept. 15 | Patchy rain possible | 30° /30° | 1.5 mm | 7 | |
| Sept. 16 | Patchy rain possible | 31° /30° | 3.9 mm | 8 | |
| Sept. 17 | Patchy rain possible | 30° /30° | 5.3 mm | 8 | |
| Sept. 18 | Patchy rain possible | 30° /30° | 0.1 mm | 7 | |
| Sept. 19 | Sunny | 30° /29° | 0 mm | 7 | |
| Sept. 20 | Cloudy | 29° /29° | 0 mm | 7 | |
| Sept. 21 | Sunny | 30° /29° | 0 mm | 7 | |
| Sept. 22 | Patchy rain possible | 30° /28° | 10.8 mm | 6 | |
| Sept. 23 | Patchy rain possible | 29° /28° | 1.5 mm | 7 | |
| Sept. 24 | Light rain shower | 30° /28° | 8.9 mm | 6 | |
| Sept. 25 | Thundery outbreaks possible | 29° /27° | 3 mm | 6 | |
| Sept. 26 | Moderate or heavy rain with thunder | 29° /27° | 16 mm | 6 | |
| Sept. 27 | Light rain shower | 29° /27° | 5.8 mm | 6 | |
| Sept. 28 |  Torrential rain shower | 30° /27° | 14.2 mm | 7 | |
| Sept. 29 |  Moderate or heavy rain shower | 29° /26° | 4.9 mm | 6 | |
| Sept. 30 | Patchy rain possible | 29° /27° | 1.1 mm | 6 | |
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Important Notice
Our weather forecast for Key West in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Key West forecast closer to your planned date for the most up-to-date weather information.
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Key West in September - FAQ
What are the expected maximum and minimum temperatures in Key West during September?
During September, expect a variety of temperatures with highs around 29° and lows near 28°, suitable for diverse activities and preferences.
How much rainfall should be expected in Key West during September?
Significant rainfall exceeding 267.4 mm is expected in Key West during September, occurring over more than 27 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Key West during September?
The average wind speed in Key West during September is 23 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Key West
Explore the daily rainfall trends and prepare for Key Wests September weather 💧
Typically, Key West has 27 rainy days in September with a total of 267.4 mm of rainfall.
UV exposure in Key West during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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