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United States weather

Weather in City of Fairfax, Virginia for September 2025

Your guide to City of Fairfax weather in September - trends and predictions

    Official Weather Alert ⚠️

  • - See hour by hour.

    • Temperatures

  • Until now, September 2025 in City of Fairfax has been nearly identical to the historical average, with a temperature of 26.4 °F (showing only a slight deviation of 0.3 °F).

  • The forecast for the next days in City of Fairfax predicts temperatures to be around 25 °F, close to the historical average.

  • In general, the average temperature in City of Fairfax at the beginning of September is 26 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 24.3 °F by the end of September.

    • Rain 🌧️

  • The climate of City of Fairfax in September is notably wet, with an average of 11 rainy days, and a total of 215.8 mm of precipitation.

    • More

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

Average dry days
19
Dry days
Average rainy days
11
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/17°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
72 %
Avg humidity

City of Fairfax Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Patchy light drizzle
27°
2
Partly cloudy
24°
3
Sunny
24°
4
Overcast
28°
5
Partly cloudy
29°
6
Patchy rain possible
29°
7
Patchy rain possible
21°
8
Sunny
24°
9
Sunny
24°
10
Sunny
26°
11
Sunny
27°
12
Sunny
28°
13
Partly cloudy
28°
14
Mist
29°
15
Weather Alert Partly cloudy
27°
16
Patchy rain possible
19°
17
Heavy rain
17°
18
Partly cloudy
29°
19
Sunny
33°
20
Sunny
27°
21
Patchy rain possible
25°
22
Partly cloudy
26°
23
Partly cloudy
28°
24
Patchy rain possible
23°
25
Sunny
26°
26
Patchy rain possible
27°
27
Moderate rain
25°
28
Patchy rain possible
24°
29
Fog
25°
30
Mist
20°

Temperatures trend during September in City of Fairfax

See the weather trend as well as the moving average line

September weather in City of Fairfax day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Patchy light drizzle
Patchy light drizzle
 27° /18° 0.7 mm 6
Sept. 2 Partly cloudy
Partly cloudy
 24° /18° 0 mm 6
Sept. 3 Sunny
Sunny
 24° /15° 0 mm 6
Sept. 4 Overcast
Overcast
 28° /16° 3.4 mm 7
Sept. 5 Partly cloudy
Partly cloudy
 29° /17° 1.6 mm 7
Sept. 6 Patchy rain possible
Patchy rain possible
 29° /19° 36.4 mm 7
Sept. 7 Patchy rain possible
Patchy rain possible
 21° /16° 3.5 mm 5
Sept. 8 Sunny
Sunny
 24° /12° 0 mm 7
Sept. 9 Sunny
Sunny
 24° /13° 0 mm 7
Sept. 10 Sunny
Sunny
 26° /15° 0 mm 6
Sept. 11 Sunny
Sunny
 27° /16° 0 mm 7
Sept. 12 Sunny
Sunny
 28° /17° 0 mm 7
Sept. 13 Partly cloudy
Partly cloudy
 28° /17° 0 mm 7
Sept. 14 Mist
Mist
 29° /19° 0 mm 6
Sept. 15 Partly cloudy
Partly cloudy
 27° /17° 0 mm 1
Sept. 16 Patchy rain possible
Patchy rain possible
 19° /18° 0.1 mm 0.5
Sept. 17 Heavy rain
Heavy rain
 17° /15° 31.9 mm 0.2
Sept. 18 Partly cloudy
Partly cloudy
 29° /18° 0 mm 1.4
Sept. 19 Sunny
Sunny
 33° /18° 0 mm 0
Sept. 20 Sunny
Sunny
 27° /18° 0 mm 6
Sept. 21 Patchy rain possible
Patchy rain possible
 25° /17° 0 mm 4
Sept. 22 Partly cloudy
Partly cloudy
 26° /15° 0 mm 5
Sept. 23 Partly cloudy
Partly cloudy
 28° /16° 0 mm 6
Sept. 24 Patchy rain possible
Patchy rain possible
 23° /19° 4.7 mm 5
Sept. 25 Sunny
Sunny
 26° /16° 0 mm 6
Sept. 26 Patchy rain possible
Patchy rain possible
 27° /17° 0.9 mm 5
Sept. 27 Moderate rain
Moderate rain
 25° /17° 5.5 mm 4
Sept. 28 Patchy rain possible
Patchy rain possible
 24° /16° 1.2 mm 4
Sept. 29 Fog
Fog
 25° /21° 0 mm 5
Sept. 30 Mist
Mist
 20° /18° 0 mm 5
Next
Important Notice
Our weather forecast for City of Fairfax 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 City of Fairfax forecast closer to your planned date for the most up-to-date weather information.
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City of Fairfax in September - FAQ

What are the expected maximum and minimum temperatures in City of Fairfax during September?
During September, expect a variety of temperatures with highs around 24° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in City of Fairfax during September?
Significant rainfall exceeding 215.8 mm is expected in City of Fairfax during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in City of Fairfax during September?
The average wind speed in City of Fairfax during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in City of Fairfax

Explore the daily rainfall trends and prepare for City of Fairfaxs September weather 💧

UV exposure in City of Fairfax during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Get accurate weather forecasts for City of Fairfax, located at latitude 38.846 and longitude -77.306. Stay updated with localized weather information tailored for City of Fairfax.

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