Fairfax (VA)
September
Weather in Fairfax, Virginia for September 2027
Your guide to Fairfax weather in September - trends and predictions
In general, the average temperature in Fairfax at the beginning of September is 28.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.4 °C by the end of September.
The climate of Fairfax in September is notably wet, with an average of 12 rainy days, and a total of 274.3 mm of precipitation.
Is September a good time to visit Fairfax? check out the best time to travel to Fairfax page.
✨ Is September a good time to visit Fairfax? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
18
Dry days
12
Rainy days
0
Snow days
26°/17°
Temperatures
13 km/h
Avg max wind
69 %
Avg humidity
Fairfax Weather September
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Temperatures trend during September in Fairfax
See the weather trend as well as the moving average line
September weather in Fairfax day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy light drizzle | 30° /20° | 0.5 mm | 7 | |
| Sept. 2 |  Heavy rain | 28° /20° | 39.3 mm | 7 | |
| Sept. 3 |  Sunny | 29° /17° | 0 mm | 6 | |
| Sept. 4 | Light rain | 30° /18° | 3.1 mm | 7 | |
| Sept. 5 |  Patchy rain possible | 29° /18° | 1.1 mm | 6 | |
| Sept. 6 |  Moderate rain | 29° /18° | 24.3 mm | 7 | |
| Sept. 7 | Patchy rain possible | 24° /16° | 2.3 mm | 6 | |
| Sept. 8 | Sunny | 26° /12° | 0 mm | 7 | |
| Sept. 9 | Sunny | 27° /15° | 0 mm | 6 | |
| Sept. 10 | Patchy rain possible | 28° /18° | 1.2 mm | 5 | |
| Sept. 11 | Heavy rain | 27° /17° | 37.2 mm | 5 | |
| Sept. 12 | Sunny | 28° /17° | 0.7 mm | 6 | |
| Sept. 13 |  Partly cloudy | 28° /19° | 0.6 mm | 5 | |
| Sept. 14 |  Mist | 28° /19° | 0 mm | 6 | |
| Sept. 15 | Partly cloudy | 27° /17° | 0 mm | 7 | |
| Sept. 16 | Light rain | 25° /17° | 4 mm | 6 | |
| Sept. 17 | Heavy rain | 23° /18° | 46.7 mm | 5 | |
| Sept. 18 | Light rain | 26° /20° | 1.4 mm | 5 | |
| Sept. 19 |  Overcast | 27° /18° | 0.4 mm | 6 | |
| Sept. 20 | Light rain | 26° /18° | 5.3 mm | 5 | |
| Sept. 21 | Moderate rain | 23° /18° | 10.1 mm | 4 | |
| Sept. 22 |  Thundery outbreaks possible | 22° /16° | 8.8 mm | 4 | |
| Sept. 23 | Moderate rain | 23° /16° | 22.2 mm | 4 | |
| Sept. 24 | Heavy rain | 22° /16° | 25.2 mm | 4 | |
| Sept. 25 | Moderate rain | 24° /17° | 11.8 mm | 5 | |
| Sept. 26 | Light rain | 24° /18° | 4 mm | 5 | |
| Sept. 27 | Moderate rain | 22° /18° | 18.9 mm | 4 | |
| Sept. 28 | Light rain | 23° /18° | 5.1 mm | 4 | |
| Sept. 29 | Fog | 25° /19° | 0 mm | 4 | |
| Sept. 30 | Overcast | 24° /18° | 0 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for 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 Fairfax forecast closer to your planned date for the most up-to-date weather information.
Change Month
Fairfax in September - FAQ
What are the expected maximum and minimum temperatures in Fairfax 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 Fairfax during September?
Significant rainfall exceeding 274.3 mm is expected in Fairfax during September, occurring over more than 12 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Fairfax during September?
The average wind speed in Fairfax during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Fairfax
Explore the daily rainfall trends and prepare for Fairfaxs September weather 💧
Typically, Fairfax has 12 rainy days in September with a total of 274.3 mm of rainfall.
UV exposure in Fairfax during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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