September
Weather in Washington, D.C. for September 2025
Your guide to Washington, D.C. weather in September - trends and predictions
In general, the average temperature in Washington, D.C. at the beginning of September is 29.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 22.7 °F by the end of September.
Washington, D.C. experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 155.1 mm.
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Temperatures
Rain 🌧️
More
7
Dry days
23
Rainy days
0
Snow days
26°/17°
Temperatures
13 km/h
Avg max wind
67 %
Avg humidity
Washington, D.C. in September average weather
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  29° | 2 28° | 3 30° | 4  31° | 5  28° | 6  30° | |
| 7  28° | 8 28° | 9 28° | 10 28° | 11 29° | 12 30° | 13 30° |
| 14 29° | 15 29° | 16 26° | 17 25° | 18 26° | 19 27° | 20 28° |
| 21 27° | 22 23° | 23 21° | 24 21° | 25  24° | 26 24° | 27 23° |
| 28 24° | 29 22° | 30 21° |
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Temperatures trend during September in Washington, D.C.
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 | 29° /18° | 6.3 mm | 7 | |
| Sept. 2 | Sunny | 28° /16° | 0.9 mm | 7 | |
| Sept. 3 | Sunny | 30° /15° | 0.1 mm | 7 | |
| Sept. 4 | Patchy rain possible | 31° /17° | 0.1 mm | 7 | |
| Sept. 5 | Moderate rain at times | 28° /19° | 1.8 mm | 7 | |
| Sept. 6 | Overcast | 30° /19° | 8.6 mm | 7 | |
| Sept. 7 | Partly cloudy | 28° /18° | 2.5 mm | 7 | |
| Sept. 8 | Patchy rain possible | 28° /17° | 1.6 mm | 7 | |
| Sept. 9 | Sunny | 28° /16° | 3.9 mm | 7 | |
| Sept. 10 | Sunny | 28° /15° | 3.3 mm | 7 | |
| Sept. 11 | Partly cloudy | 29° /17° | 6.4 mm | 7 | |
| Sept. 12 | Sunny | 30° /18° | 5.7 mm | 7 | |
| Sept. 13 | Partly cloudy | 30° /18° | 1.1 mm | 7 | |
| Sept. 14 | Sunny | 29° /17° | 0 mm | 7 | |
| Sept. 15 | Partly cloudy | 29° /16° | 0.1 mm | 7 | |
| Sept. 16 | Sunny | 26° /16° | 4.1 mm | 6 | |
| Sept. 17 | Moderate or heavy rain shower | 25° /17° | 10.5 mm | 6 | |
| Sept. 18 | Patchy rain possible | 26° /17° | 9.8 mm | 6 | |
| Sept. 19 | Sunny | 27° /17° | 0 mm | 7 | |
| Sept. 20 | Partly cloudy | 28° /17° | 0 mm | 7 | |
| Sept. 21 | Overcast | 27° /17° | 6.2 mm | 7 | |
| Sept. 22 | Patchy rain possible | 23° /16° | 7 mm | 5 | |
| Sept. 23 | Moderate or heavy rain shower | 21° /14° | 23.5 mm | 5 | |
| Sept. 24 | Sunny | 21° /14° | 24.4 mm | 5 | |
| Sept. 25 | Cloudy | 24° /14° | 2.2 mm | 5 | |
| Sept. 26 | Sunny | 24° /16° | 3.7 mm | 6 | |
| Sept. 27 | Partly cloudy | 23° /14° | 10 mm | 6 | |
| Sept. 28 | Moderate or heavy rain shower | 24° /14° | 2.7 mm | 5 | |
| Sept. 29 | Partly cloudy | 22° /15° | 0.8 mm | 6 | |
| Sept. 30 | Sunny | 21° /14° | 7.9 mm | 5 | |
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Important Notice
Our weather forecast for Washington, D.C. 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 Washington, D.C. forecast closer to your planned date for the most up-to-date weather information.
Washington, D.C. in September - FAQ
What are the expected maximum and minimum temperatures in Washington, D.C. during September?
During September, expect a variety of temperatures with highs around 26° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Washington, D.C. during September?
Significant rainfall exceeding 155.1 mm is expected in Washington, D.C. during September, occurring over more than 23 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Washington, D.C. during September?
The average wind speed in Washington, D.C. during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Washington, D.C.
Explore the daily rainfall trends and prepare for Washington, D.C.s September weather 💧
UV exposure in Washington, D.C. during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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