Key West (FL)
September
Weather in Key West, Florida for September 2027
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 29.5 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 28.7 °C by the end of September.
Key West in September brings notable rainfall, with an average of 19 rainy days and a total precipitation of 294.3 mm.
Is September a good time to visit Key West? check out the best time to travel to Key West page.
✨ Is September a good time to visit Key West? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
11
Dry days
19
Rainy days
0
Snow days
29°/28°
Temperatures
22 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 |  Moderate rain | 30° /28° | 21.3 mm | 7 | |
| Sept. 2 |  Thundery outbreaks possible | 29° /28° | 20.5 mm | 6 | |
| Sept. 3 | Moderate rain | 30° /28° | 14.3 mm | 8 | |
| Sept. 4 |  Moderate or heavy rain with thunder | 29° /27° | 21.2 mm | 7 | |
| Sept. 5 | Moderate rain | 29° /28° | 11.8 mm | 5 | |
| Sept. 6 | Moderate rain | 29° /28° | 11.3 mm | 6 | |
| Sept. 7 |  Heavy rain | 29° /28° | 34.7 mm | 5 | |
| Sept. 8 |  Light rain | 30° /28° | 6.1 mm | 6 | |
| Sept. 9 | Light rain | 29° /28° | 3 mm | 6 | |
| Sept. 10 |  Patchy rain possible | 30° /28° | 2 mm | 6 | |
| Sept. 11 | Light rain | 30° /28° | 4.1 mm | 6 | |
| Sept. 12 |  Cloudy | 30° /28° | 0.4 mm | 6 | |
| Sept. 13 | Moderate rain | 29° /28° | 10.1 mm | 5 | |
| Sept. 14 | Patchy rain possible | 30° /29° | 1.7 mm | 8 | |
| Sept. 15 | Patchy rain possible | 29° /29° | 1.7 mm | 6 | |
| Sept. 16 | Patchy rain possible | 30° /29° | 1.3 mm | 7 | |
| Sept. 17 | Moderate rain | 29° /28° | 13.2 mm | 5 | |
| Sept. 18 |  Moderate or heavy rain shower | 29° /28° | 5.7 mm | 6 | |
| Sept. 19 | Moderate rain | 30° /28° | 19.7 mm | 7 | |
| Sept. 20 | Moderate rain | 30° /28° | 12.3 mm | 7 | |
| Sept. 21 | Moderate or heavy rain shower | 29° /28° | 8.8 mm | 6 | |
| Sept. 22 | Light rain | 29° /27° | 8.2 mm | 5 | |
| Sept. 23 | Moderate rain | 28° /27° | 10.7 mm | 5 | |
| Sept. 24 | Light rain | 29° /28° | 6.7 mm | 5 | |
| Sept. 25 | Thundery outbreaks possible | 29° /28° | 3.6 mm | 7 | |
| Sept. 26 | Moderate or heavy rain with thunder | 29° /27° | 12.7 mm | 6 | |
| Sept. 27 | Light rain | 29° /28° | 4.3 mm | 7 | |
| Sept. 28 | Torrential rain shower | 29° /27° | 11.9 mm | 6 | |
| Sept. 29 | Moderate or heavy rain shower | 29° /27° | 6.1 mm | 5 | |
| Sept. 30 | Light rain | 28° /27° | 4.7 mm | 5 | |
| Next | |||||
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 294.3 mm is expected in Key West during September, occurring over more than 19 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.
September rainfall patterns in Key West
Explore the daily rainfall trends and prepare for Key Wests September weather 💧
Typically, Key West has 19 rainy days in September with a total of 294.3 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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