Key West (FL)
September
Weather in Key West, Florida for September 2025
Your guide to Key West weather in September - trends and predictions
Until now, September 2025 in Key West has been nearly identical to the historical average, with a temperature of 29.3 °F (showing only a slight deviation of -0.3 °F).
The forecast for the next days in Key West predicts temperatures to be around 29 °F, close to the historical average.
In general, the average temperature in Key West at the beginning of September is 29.3 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of 29 °F by the end of September.
Key West experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 228.5 mm.
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Temperatures
Rain 🌧️
More
7
Dry days
23
Rainy days
0
Snow days
29°/28°
Temperatures
23 km/h
Avg max wind
75 %
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° | 11.5 mm | 7 | |
| Sept. 2 |  Thundery outbreaks possible | 29° /28° | 27 mm | 6 | |
| Sept. 3 |  Light rain shower | 29° /27° | 19.1 mm | 6 | |
| Sept. 4 |  Moderate or heavy rain with thunder | 29° /27° | 28 mm | 6 | |
| Sept. 5 | Patchy rain possible | 29° /28° | 7.2 mm | 6 | |
| Sept. 6 |  Partly cloudy | 30° /28° | 14.2 mm | 7 | |
| Sept. 7 |  Cloudy | 29° /28° | 1.5 mm | 6 | |
| Sept. 8 | Sunny | 30° /28° | 5.5 mm | 7 | |
| Sept. 9 | Patchy rain possible | 29° /28° | 2.2 mm | 6 | |
| Sept. 10 | Partly cloudy | 30° /28° | 0.7 mm | 7 | |
| Sept. 11 | Patchy rain possible | 30° /28° | 1.4 mm | 7 | |
| Sept. 12 | Cloudy | 30° /28° | 0 mm | 7 | |
| Sept. 13 | Light rain shower | 30° /28° | 1.6 mm | 7 | |
| Sept. 14 | Patchy rain possible | 30° /28° | 2.3 mm | 2.4 | |
| Sept. 15 | Patchy rain possible | 29° /28° | 4.9 mm | 2.3 | |
| Sept. 16 | Patchy rain possible | 31° /29° | 1.7 mm | 2.4 | |
| Sept. 17 |  Heavy rain | 28° /26° | 35.2 mm | 1 | |
| Sept. 18 |  Moderate rain | 28° /26° | 15.7 mm | 0 | |
| Sept. 19 | Moderate rain | 28° /26° | 5 mm | 6 | |
| Sept. 20 | Patchy rain possible | 29° /28° | 2.9 mm | 6 | |
| Sept. 21 | Moderate rain | 28° /28° | 8.9 mm | 6 | |
| Sept. 22 | Patchy rain possible | 28° /27° | 0.9 mm | 6 | |
| Sept. 23 | Patchy rain possible | 29° /27° | 3 mm | 6 | |
| Sept. 24 | Patchy rain possible | 29° /28° | 1 mm | 6 | |
| Sept. 25 | Patchy rain possible | 29° /29° | 0.4 mm | 6 | |
| Sept. 26 | Patchy rain possible | 29° /29° | 3.1 mm | 6 | |
| Sept. 27 | Patchy rain possible | 29° /28° | 0.4 mm | 6 | |
| Sept. 28 | Torrential rain shower | 30° /26° | 21.2 mm | 7 | |
| Sept. 29 |  Moderate or heavy rain shower | 29° /26° | 5.6 mm | 6 | |
| Sept. 30 | Patchy rain possible | 28° /27° | 1.6 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.
Change Month
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 228.5 mm is expected in Key West during September, occurring over more than 23 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 💧
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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