September
Weather in Washington, D.C. for September 2026
Your guide to Washington, D.C. weather in September - trends and predictions
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So far, September 2026 in Washington, D.C. is slightly warmer than the historical average by 1.3 °F.
The forecast for the next days in Washington, D.C. predicts temperatures to be around 22 °F, close to the historical average.
In general, the average temperature in Washington, D.C. at the beginning of September is 29.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 22.9 °F by the end of September.
Washington, D.C. experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 169.6 mm.
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Temperatures
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20
Dry days
10
Rainy days
0
Snow days
26°/17°
Temperatures
13 km/h
Avg max wind
67 %
Avg humidity
Washington, D.C. Weather September
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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 in Washington, D.C. day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 30° /18° | 4.2 mm | 7 | |
| Sept. 2 | Sunny | 29° /18° | 2 mm | 7 | |
| Sept. 3 | Sunny | 30° /16° | 2.8 mm | 7 | |
| Sept. 4 |  Partly cloudy | 32° /18° | 1.2 mm | 7 | |
| Sept. 5 |  Moderate rain at times | 29° /19° | 2.4 mm | 7 | |
| Sept. 6 | Sunny | 31° /19° | 10.7 mm | 7 | |
| Sept. 7 | Partly cloudy | 28° /17° | 5.7 mm | 7 | |
| Sept. 8 | Sunny | 29° /16° | 1.1 mm | 7 | |
| Sept. 9 | Sunny | 28° /16° | 2.6 mm | 6 | |
| Sept. 10 | Sunny | 29° /17° | 2.4 mm | 6 | |
| Sept. 11 | Moderate or heavy rain shower | 28° /17° | 11.5 mm | 6 | |
| Sept. 12 | Sunny | 29° /18° | 4.7 mm | 7 | |
| Sept. 13 | Partly cloudy | 30° /18° | 1.6 mm | 6 | |
| Sept. 14 | Sunny | 29° /17° | 0 mm | 7 | |
| Sept. 15 | Partly cloudy | 29° /16° | 0 mm | 7 | |
| Sept. 16 |  Overcast | 26° /16° | 2.7 mm | 6 | |
| Sept. 17 | Moderate or heavy rain shower | 25° /17° | 16.7 mm | 5 | |
| Sept. 18 |  Patchy rain possible | 28° /18° | 7 mm | 6 | |
| Sept. 19 | Sunny | 28° /17° | 0 mm | 6 | |
| Sept. 20 | Partly cloudy | 27° /18° | 2.8 mm | 6 | |
| Sept. 21 | Overcast | 26° /17° | 6.9 mm | 6 | |
| Sept. 22 | Moderate or heavy rain shower | 23° /16° | 7.4 mm | 5 | |
| Sept. 23 | Moderate or heavy rain shower | 22° /14° | 29.6 mm | 5 | |
| Sept. 24 | Sunny | 22° /14° | 16.2 mm | 4 | |
| Sept. 25 |  Cloudy | 25° /15° | 7.5 mm | 5 | |
| Sept. 26 | Overcast | 20° /14° | 2.1 mm | 1.2 | |
| Sept. 27 | Overcast | 22° /15° | 0.4 mm | 1.7 | |
| Sept. 28 | Overcast | 20° /15° | 0 mm | 2.3 | |
| Sept. 29 | Overcast | 24° /17° | 0 mm | 4 | |
| Sept. 30 | Overcast | 27° /16° | 0 mm | 7 | |
| Next | |||||
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.
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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 169.6 mm is expected in Washington, D.C. during September, occurring over more than 10 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 💧
Typically, Washington, D.C. has 10 rainy days in September with a total of 169.6 mm of rainfall.
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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