Fairfax County weather, town by town
67 places in Fairfax County, Virginia, each with its own live forecast and radar, and where a station sits close enough, measured weather records.
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Measured at the NOAA stations serving these towns, daily records 1925 to 2026. Station extremes, not official state records.
Fairfax County Weather Facts
Fairfax County has 67 places on myweatherrock (64 census-designated places, 3 towns), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 106°F at Manassas on July 23, 2011. The coldest night is -18°F at Washington Dulles Intl Ap on January 22, 1984. The wettest day brought 10.67 inches of rain at Washington Dulles Intl Ap on June 21, 1972. The biggest single-day snow measured 22.99 inches at Vienna on February 11, 1983. Those are station measurements from NOAA's daily records, 1925 to 2026, not official state records. By area the largest place is Great Falls, about 25 square miles.
About Fairfax County weather
The map on the Now tab shows every Fairfax County town's current temperature from our own server, one dot per town. Tap any dot, or type a town above, for that town's full forecast.
What the weather is usually like
Across the 46 Fairfax County towns with station normals, the warmest month is July, when the day usually reaches 86°F, and the coldest is January, when the night usually falls to 25°F. May is the wettest, with rain on about 13 days. July afternoons run from about 84°F in Annandale to 90°F in Clifton. January nights run from about 25°F in Annandale to 30°F in Bailey's Crossroads.
Means of the 1991 to 2020 station normals serving these towns, as published by NOAA; each town's page carries its own.
Where these numbers come from
- Current conditions and forecast: NOAA forecast grids decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
- Records: computed by myweatherrock from NOAA GHCN-Daily station records at the stations serving these towns. Measurements, not estimates.
- Warnings and alerts: the National Weather Service, passed through unchanged.
Fairfax County weather records
Measured at the NOAA stations serving these towns, daily records 1925 to 2026. Station extremes, not official state records.
Common questions about Fairfax County weather
- What is the hottest temperature recorded at a Fairfax County station?
- 106°F at Manassas on July 23, 2011, in the NOAA daily station records myweatherrock holds (1925 to 2026).
- What is the coldest temperature recorded at a Fairfax County station?
- -18°F at Washington Dulles Intl Ap on January 22, 1984.
- What is the most rain a Fairfax County station has measured in one day?
- 10.67 inches at Washington Dulles Intl Ap on June 21, 1972.
- What is the biggest one-day snowfall at a Fairfax County station?
- 22.99 inches at Vienna on February 11, 1983.
- How many Fairfax County towns have a weather page here?
- 67: 64 census-designated places, 3 towns. Each page carries current conditions, the hourly timeline, the ten day outlook, radar, and where a station sits close enough, measured records.
- Where does the Fairfax County forecast come from?
- NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
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