Key West
September
Weather in Key West for September 2025
Your guide to Key West weather in September - trends and predictions
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 29.1 °F by the end of September.
Key West experiences an exceptionally high level of rainfall in September, with more than 20 rainy days on average.
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9
Dry days
21
Rainy days
0
Snow days
29°/28°
Temperatures
22 km/h
Avg max wind
73 %
Avg humidity
Key West in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  30° | 2  29° | 3  29° | 4  29° | 5 29° | 6  30° | 7  29° |
| 8 29° | 9 29° | 10 29° | 11 30° | 12 30° | 13 30° | 14 31° |
| 15  29° | 16 30° | 17 29° | 18 29° | 19 30° | 20 30° | 21  29° |
| 22 29° | 23  29° | 24 30° | 25 29° | 26 29° | 27 29° | 28  30° |
| 29 29° | 30 28° |
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Temperatures trend during September in Key West
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 30° /28° | 8.7 mm | 7 | |
| Sept. 2 | Thundery outbreaks possible | 29° /28° | 6 mm | 6 | |
| Sept. 3 | Light rain shower | 29° /27° | 7.5 mm | 7 | |
| Sept. 4 | Moderate or heavy rain with thunder | 29° /27° | 12.3 mm | 7 | |
| Sept. 5 | Patchy rain possible | 29° /28° | 0.8 mm | 6 | |
| Sept. 6 | Partly cloudy | 30° /28° | 1.2 mm | 7 | |
| Sept. 7 | Cloudy | 29° /28° | 0.2 mm | 6 | |
| Sept. 8 | Sunny | 29° /28° | 0.1 mm | 7 | |
| Sept. 9 | Patchy rain possible | 29° /28° | 1.5 mm | 6 | |
| Sept. 10 | Partly cloudy | 29° /28° | 1 mm | 7 | |
| Sept. 11 | Patchy rain possible | 30° /28° | 2.1 mm | 7 | |
| Sept. 12 | Cloudy | 30° /28° | 0 mm | 7 | |
| Sept. 13 | Light rain shower | 30° /28° | 1.6 mm | 7 | |
| Sept. 14 | Partly cloudy | 31° /29° | 0.6 mm | 7 | |
| Sept. 15 | Overcast | 29° /28° | 0.1 mm | 6 | |
| Sept. 16 | Light rain shower | 30° /28° | 0.5 mm | 7 | |
| Sept. 17 | Patchy rain possible | 29° /27° | 23.7 mm | 6 | |
| Sept. 18 | Partly cloudy | 29° /28° | 6.3 mm | 7 | |
| Sept. 19 | Cloudy | 30° /28° | 32.9 mm | 7 | |
| Sept. 20 | Moderate or heavy rain with thunder | 30° /28° | 17 mm | 7 | |
| Sept. 21 | Moderate or heavy rain shower | 29° /28° | 9 mm | 6 | |
| Sept. 22 | Patchy rain possible | 29° /27° | 5.8 mm | 6 | |
| Sept. 23 | Patchy light rain with thunder | 29° /27° | 10.8 mm | 7 | |
| Sept. 24 | Light rain shower | 30° /28° | 13.4 mm | 7 | |
| Sept. 25 | Thundery outbreaks possible | 29° /27° | 4.5 mm | 6 | |
| Sept. 26 | Moderate or heavy rain with thunder | 29° /28° | 24 mm | 6 | |
| Sept. 27 | Light rain shower | 29° /27° | 8.6 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.
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 217.1 mm is expected in Key West during September, occurring over more than 21 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 22 km/h, suggesting breezy to windy conditions, depending on your activities.
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