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United States weather

Weather in Washington, Washington, D.C. for September 2025

Your guide to Washington weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Washington is cooler than usual, with temperatures averaging 26.5 °F, this is -2.3 °F below the typical seasonal average.

  • Expect cooler weather in the next days in Washington with the forecast suggesting a temperature of 27.5 °F, lower than the historical average.

  • In general, the average temperature in Washington at the beginning of September is 29.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.1 °F by the end of September.

    • Rain 🌧️

  • Washington experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 155.1 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
7
Dry days
Average rainy days
23
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/17°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
67 %
Avg humidity

Washington Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
29°
2
Overcast
28°
3
Sunny
29°
4
Partly cloudy
31°
5
Moderate rain at times
29°
6
Overcast
31°
7
Partly cloudy
27°
8
Patchy rain possible
28°
9
Sunny
27°
10
Sunny
28°
11
Partly cloudy
29°
12
Sunny
29°
13
Sunny
31°
14
Partly cloudy
30°
15
Partly cloudy
28°
16
Partly cloudy
28°
17
Partly cloudy
25°
18
Sunny
30°
19
Sunny
32°
20
Patchy rain possible
32°
21
Sunny
29°
22
Partly cloudy
23°
23
Patchy rain possible
25°
24
Patchy rain possible
25°
25
Sunny
24°
26
Patchy rain possible
23°
27
Partly cloudy
23°
28
Moderate or heavy rain shower
24°
29
Partly cloudy
22°
30
Sunny
21°

Temperatures trend during September in Washington

See the weather trend as well as the moving average line

September weather in Washington day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 29° /18° 5 mm 7
Sept. 2 Overcast
Overcast
 28° /17° 0.7 mm 7
Sept. 3 Sunny
Sunny
 29° /16° 0 mm 7
Sept. 4 Partly cloudy
Partly cloudy
 31° /17° 1.1 mm 7
Sept. 5 Moderate rain at times
Moderate rain at times
 29° /19° 2.9 mm 7
Sept. 6 Overcast
Overcast
 31° /19° 12.8 mm 7
Sept. 7 Partly cloudy
Partly cloudy
 27° /18° 6.9 mm 6
Sept. 8 Patchy rain possible
Patchy rain possible
 28° /16° 1.3 mm 7
Sept. 9 Sunny
Sunny
 27° /16° 3.1 mm 7
Sept. 10 Sunny
Sunny
 28° /16° 2.6 mm 7
Sept. 11 Partly cloudy
Partly cloudy
 29° /17° 5.1 mm 7
Sept. 12 Sunny
Sunny
 29° /17° 4.5 mm 7
Sept. 13 Sunny
Sunny
 31° /15° 0 mm 1.5
Sept. 14 Partly cloudy
Partly cloudy
 30° /19° 0 mm 1.1
Sept. 15 Partly cloudy
Partly cloudy
 28° /21° 0 mm 1.4
Sept. 16 Partly cloudy
Partly cloudy
 28° /17° 0 mm 1.4
Sept. 17 Partly cloudy
Partly cloudy
 25° /18° 0 mm 0
Sept. 18 Sunny
Sunny
 30° /16° 0 mm 6
Sept. 19 Sunny
Sunny
 32° /18° 0 mm 6
Sept. 20 Patchy rain possible
Patchy rain possible
 32° /20° 0.4 mm 5
Sept. 21 Sunny
Sunny
 29° /20° 0 mm 6
Sept. 22 Partly cloudy
Partly cloudy
 23° /17° 0 mm 6
Sept. 23 Patchy rain possible
Patchy rain possible
 25° /18° 2.4 mm 5
Sept. 24 Patchy rain possible
Patchy rain possible
 25° /18° 1 mm 5
Sept. 25 Sunny
Sunny
 24° /16° 0 mm 5
Sept. 26 Patchy rain possible
Patchy rain possible
 23° /12° 0.5 mm 4
Sept. 27 Partly cloudy
Partly cloudy
 23° /14° 10 mm 6
Sept. 28 Moderate or heavy rain shower
Moderate or heavy rain shower
 24° /14° 2.7 mm 5
Sept. 29 Partly cloudy
Partly cloudy
 22° /15° 0.8 mm 6
Sept. 30 Sunny
Sunny
 21° /14° 7.9 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.
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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 155.1 mm is expected in Washington 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 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 💧

UV exposure in Washington during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates 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.

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