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Washington County (Washington)
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United States weather

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

Your guide to Washington County weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Coastal Flood Advisory - See hour by hour.

    • Temperatures

  • Until now, September 2025 in Washington County is cooler than usual, with temperatures averaging 26.8 °F, this is -2.1 °F below the typical seasonal average.

  • Expect cooler weather in the next days in Washington County with the forecast suggesting a temperature of 26 °F, lower than the historical average.

  • In general, the average temperature in Washington County at the beginning of September is 29.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 24.6 °F by the end of September.

    • Rain 🌧️

  • Washington County 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 County 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
Partly cloudy
30°
14
Sunny
29°
15
Weather Alert Partly cloudy
27°
16
Overcast
20°
17
Heavy rain
18°
18
Partly cloudy
30°
19
Sunny
33°
20
Sunny
27°
21
Overcast
25°
22
Partly cloudy
27°
23
Partly cloudy
28°
24
Patchy rain possible
24°
25
Sunny
27°
26
Patchy rain possible
29°
27
Moderate rain
25°
28
Patchy rain possible
24°
29
Partly cloudy
22°
30
Sunny
21°

Temperatures trend during September in Washington County

See the weather trend as well as the moving average line

September weather in Washington County 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 Partly cloudy
Partly cloudy
 30° /18° 0.9 mm 7
Sept. 14 Sunny
Sunny
 29° /17° 0 mm 7
Sept. 15 Partly cloudy
Partly cloudy
 27° /18° 0 mm 1.1
Sept. 16 Overcast
Overcast
 20° /17° 0.1 mm 0.4
Sept. 17 Heavy rain
Heavy rain
 18° /15° 29.4 mm 0.2
Sept. 18 Partly cloudy
Partly cloudy
 30° /17° 0 mm 1.4
Sept. 19 Sunny
Sunny
 33° /18° 0 mm 0
Sept. 20 Sunny
Sunny
 27° /18° 0 mm 6
Sept. 21 Overcast
Overcast
 25° /17° 0 mm 5
Sept. 22 Partly cloudy
Partly cloudy
 27° /16° 0 mm 6
Sept. 23 Partly cloudy
Partly cloudy
 28° /16° 0 mm 6
Sept. 24 Patchy rain possible
Patchy rain possible
 24° /19° 3.5 mm 5
Sept. 25 Sunny
Sunny
 27° /16° 0 mm 6
Sept. 26 Patchy rain possible
Patchy rain possible
 29° /18° 0.7 mm 5
Sept. 27 Moderate rain
Moderate rain
 25° /18° 7.4 mm 4
Sept. 28 Patchy rain possible
Patchy rain possible
 24° /16° 0.2 mm 4
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 County 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 County forecast closer to your planned date for the most up-to-date weather information.
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Washington County in September - FAQ

What are the expected maximum and minimum temperatures in Washington County 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 County during September?
Significant rainfall exceeding 155.1 mm is expected in Washington County 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 County during September?
The average wind speed in Washington County during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Washington County

Explore the daily rainfall trends and prepare for Washington Countys September weather 💧

UV exposure in Washington County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Washington County
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FayettevilleSouth KingstownWashingtonZion National Park
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Location coordinates Where is Washington County?

Get accurate weather forecasts for Washington County, located at latitude 38.895 and longitude -77.036. Stay updated with localized weather information tailored for Washington County.

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