Weather in Washington, Washington, D.C. for September 2026
Small Craft Advisory - See hour by hour.
So far, September 2026 in Washington shows a warmer trend than usual by 4 °F.
Expect cooler weather in the next days in Washington with the forecast suggesting a temperature of 27.4 °F, lower than the historical average.
In general, the average temperature in Washington at the beginning of September is 29.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.3 °F by the end of September.
Washington experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 169.6 mm.
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Washington Weather September
Temperatures trend during September in Washington
September weather in Washington day by day
| 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 | 33° /22° | 13.6 mm | 7.3 | |
| Sept. 11 |  Overcast | 25° /19° | 1.8 mm | 6.1 | |
| Sept. 12 | Overcast | 28° /18° | 0.1 mm | 4.8 | |
| Sept. 13 |  Patchy rain possible | 27° /21° | 5.7 mm | 7 | |
| Sept. 14 | Overcast | 32° /22° | 1.4 mm | 7 | |
| Sept. 15 | Sunny | 34° /23° | 1.8 mm | 8 | |
| Sept. 16 | Sunny | 34° /25° | 0 mm | 8 | |
| Sept. 17 | Sunny | 30° /20° | 0 mm | 7 | |
| Sept. 18 | Overcast | 24° /16° | 1.8 mm | 6 | |
| Sept. 19 | Sunny | 19° /11° | 0 mm | 5 | |
| Sept. 20 | Sunny | 21° /11° | 0 mm | 6 | |
| Sept. 21 | Sunny | 24° /13° | 0 mm | 6 | |
| Sept. 22 | Sunny | 26° /14° | 0 mm | 7 | |
| Sept. 23 | Overcast | 26° /16° | 0 mm | 6 | |
| Sept. 24 | Sunny | 23° /15° | 19.5 mm | 5 | |
| Sept. 25 |  Cloudy | 25° /15° | 9 mm | 5 | |
| Sept. 26 | Sunny | 24° /17° | 3 mm | 6 | |
| Sept. 27 | Partly cloudy | 23° /15° | 8 mm | 6 | |
| Sept. 28 | Moderate or heavy rain shower | 23° /15° | 2.8 mm | 5 | |
| Sept. 29 |  Fog | 23° /15° | 0.7 mm | 6 | |
| Sept. 30 | Sunny | 22° /15° | 6.3 mm | 5 | |
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Washington in September - FAQ
What are the expected maximum and minimum temperatures in Washington during September?
How much rainfall should be expected in Washington during September?
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September rainfall patterns in Washington
UV exposure in Washington during September
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Where is Washington?Get accurate weather forecasts for Washington, located at latitude 38.895 and longitude -77.036. Stay updated with localized weather information tailored for Washington.