Washington
September
Weather in Washington, Washington, D.C. for September 2027
Your guide to Washington weather in September - trends and predictions
In general, the average temperature in Washington at the beginning of September is 29.5 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 22.6 °C by the end of September.
The climate of Washington in September is notably wet, with an average of 11 rainy days, and a total of 169.5 mm of precipitation.
Is September a good time to visit Washington? check out the best time to travel to Washington page.
✨ Is September a good time to visit Washington? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
19
Dry days
11
Rainy days
0
Snow days
26°/17°
Temperatures
13 km/h
Avg max wind
68 %
Avg humidity
Washington Weather September
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Temperatures trend during September in Washington
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September weather in Washington day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Light rain | 30° /19° | 4.2 mm | 7 | |
| Sept. 2 |  Patchy rain possible | 29° /18° | 2 mm | 7 | |
| Sept. 3 | Light rain | 30° /17° | 2.8 mm | 7 | |
| Sept. 4 | Patchy rain possible | 31° /18° | 1.2 mm | 7 | |
| Sept. 5 | Patchy rain possible | 29° /20° | 2.4 mm | 7 | |
| Sept. 6 |  Moderate rain | 30° /19° | 10.7 mm | 7 | |
| Sept. 7 | Light rain | 28° /18° | 5.7 mm | 7 | |
| Sept. 8 | Patchy rain possible | 28° /16° | 1.1 mm | 7 | |
| Sept. 9 | Light rain | 28° /16° | 2.6 mm | 6 | |
| Sept. 10 | Patchy rain possible | 28° /17° | 2.4 mm | 6 | |
| Sept. 11 | Moderate rain | 28° /18° | 11.5 mm | 6 | |
| Sept. 12 | Light rain | 29° /18° | 4.7 mm | 7 | |
| Sept. 13 | Patchy rain possible | 29° /19° | 1.6 mm | 6 | |
| Sept. 14 |  Sunny | 29° /18° | 0 mm | 7 | |
| Sept. 15 |  Partly cloudy | 28° /17° | 0 mm | 7 | |
| Sept. 16 | Light rain | 26° /16° | 2.7 mm | 6 | |
| Sept. 17 | Moderate rain | 24° /17° | 16.7 mm | 5 | |
| Sept. 18 | Light rain | 27° /18° | 7 mm | 6 | |
| Sept. 19 | Sunny | 28° /17° | 0 mm | 6 | |
| Sept. 20 | Light rain | 27° /18° | 2.8 mm | 6 | |
| Sept. 21 | Light rain | 26° /17° | 6.9 mm | 6 | |
| Sept. 22 |  Moderate or heavy rain shower | 23° /16° | 7.4 mm | 5 | |
| Sept. 23 |  Heavy rain | 22° /15° | 29.6 mm | 5 | |
| Sept. 24 | Moderate rain | 22° /15° | 16.2 mm | 4 | |
| Sept. 25 | Light rain | 24° /15° | 7.5 mm | 5 | |
| Sept. 26 | Light rain | 23° /16° | 3.7 mm | 5 | |
| Sept. 27 | Light rain | 22° /15° | 7.8 mm | 5 | |
| Sept. 28 | Patchy rain possible | 22° /15° | 2.3 mm | 4 | |
| Sept. 29 |  Fog | 23° /16° | 0.6 mm | 5 | |
| Sept. 30 | Light rain | 23° /15° | 5.3 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for Washington 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 forecast closer to your planned date for the most up-to-date weather information.
Change Month
Washington in September - FAQ
What are the expected maximum and minimum temperatures in Washington 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 during September?
Significant rainfall exceeding 169.5 mm is expected in Washington during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Washington during September?
The average wind speed in Washington during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Washington
Explore the daily rainfall trends and prepare for Washingtons September weather 💧
Typically, Washington has 11 rainy days in September with a total of 169.5 mm of rainfall.
UV exposure in Washington during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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