Monroe County (Key West)
September
Weather in Monroe County for September 2025
Your guide to Monroe County weather in September - trends and predictions
In general, the average temperature in Monroe County 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.
Monroe County experiences an exceptionally high level of rainfall in September, with more than 20 rainy days on average.
- New! Chat with our AI weatherman - it’s amazing and free.
9
Dry days
21
Rainy days
0
Snow days
29°/28°
Temperatures
22 km/h
Avg max wind
73 %
Avg humidity
Monroe County in September average weather
Move between months or click on a day
| 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° |
You can click on date
Access Monroe County weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in Monroe County
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
| 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 | |
| Next | |||||
Important Notice
Our weather forecast for Monroe County 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 Monroe County forecast closer to your planned date for the most up-to-date weather information.
Monroe County in September - FAQ
What are the expected maximum and minimum temperatures in Monroe County 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 Monroe County during September?
Significant rainfall exceeding 217.1 mm is expected in Monroe County during September, occurring over more than 21 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Monroe County during September?
The average wind speed in Monroe County during September is 22 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Monroe County
Explore the daily rainfall trends and prepare for Monroe Countys September weather 💧
UV exposure in Monroe County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Monroe County
Select a location for an accurate weather forecast
More Locations Quick links
You are here
Where is Monroe County?Get accurate weather forecasts for Monroe County, located at latitude 24.555 and longitude -81.782. Stay updated with localized weather information tailored for Monroe County.
Found a mistake?
We appreciate your attention to details. Tell us here.