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Washington, D.C. United States

Weather in Washington County for September 2025

Your guide to Washington County weather in September - trends and predictions
  • In general, the average temperature in Washington County at the beginning of September is 30.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.6 °F by the end of September.

  • The climate of Washington County in September is notably wet, with an average of 14 rainy days.

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Average dry days
16
Dry days
Average rainy days
14
Rainy days
Average snowy days
0
Snow days
Average temperatures
27°/16°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
69 %
Avg humidity

Washington County in September average weather

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Temperatures trend during September in Washington County

See the weather trend as well as the moving average line

September weather day by day

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Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
29° /17° 0.5 mm 7
Sept. 2 Sunny
Sunny
28° /16° 0 mm 8
Sept. 3 Partly cloudy
Partly cloudy
30° /15° 0 mm 8
Sept. 4 Patchy rain possible
Patchy rain possible
31° /18° 0.2 mm 7
Sept. 5 Sunny
Sunny
32° /19° 0 mm 8
Sept. 6 Sunny
Sunny
32° /19° 0.4 mm 8
Sept. 7 Thundery outbreaks possible
Thundery outbreaks possible
29° /18° 0.4 mm 7
Sept. 8 Partly cloudy
Partly cloudy
28° /15° 2.9 mm 7
Sept. 9 Light rain shower
Light rain shower
29° /15° 2.9 mm 7
Sept. 10 Light rain shower
Light rain shower
30° /16° 6.3 mm 7
Sept. 11 Patchy rain possible
Patchy rain possible
31° /17° 0.6 mm 8
Sept. 12 Mist
Mist
29° /18° 0 mm 7
Sept. 13 Light rain shower
Light rain shower
28° /17° 2.2 mm 7
Sept. 14 Sunny
Sunny
27° /17° 0 mm 7
Sept. 15 Sunny
Sunny
27° /14° 0 mm 7
Sept. 16 Sunny
Sunny
26° /14° 5.6 mm 6
Sept. 17 Heavy rain
Heavy rain
21° /17° 18.8 mm 5
Sept. 18 Light rain
Light rain
22° /17° 19.5 mm 5
Sept. 19 Sunny
Sunny
23° /16° 0 mm 6
Sept. 20 Partly cloudy
Partly cloudy
27° /16° 0 mm 7
Sept. 21 Partly cloudy
Partly cloudy
26° /17° 12.4 mm 6
Sept. 22 Patchy rain possible
Patchy rain possible
22° /16° 5.5 mm 5
Sept. 23 Heavy rain
Heavy rain
20° /15° 34.2 mm 5
Sept. 24 Light rain shower
Light rain shower
19° /17° 48.6 mm 4
Sept. 25 Patchy rain possible
Patchy rain possible
21° /16° 3.3 mm 5
Sept. 26 Fog
Fog
22° /18° 7.5 mm 5
Sept. 27 Patchy rain possible
Patchy rain possible
21° /17° 20 mm 5
Sept. 28 Overcast
Overcast
24° /16° 2.8 mm 6
Sept. 29 Moderate or heavy rain shower
Moderate or heavy rain shower
22° /18° 1.7 mm 5
Sept. 30 Patchy rain possible
Patchy rain possible
22° /16° 0.6 mm 5
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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.

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 27° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Washington County during September?
Significant rainfall exceeding 161.8 mm is expected in Washington County during September, occurring over more than 14 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 ☀️
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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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