Fairfax, VA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fairfax, a city in Fairfax County, Virginia.
Today
79°F
Partly Sunny
Partly sunny, with a high near 79. Northeast wind around 7 mph.
7-day forecast for Fairfax
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Partly Sunny | 7 mph NE | 7% |
| Tonight | 65°F | Mostly Cloudy | 7 mph SE | 12% |
| Sunday | 84°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 7 to 12 mph S | 38% |
| Sunday Night | 63°F | Showers And Thunderstorms Likely | 3 to 10 mph NW | 70% |
| Monday | 71°F | Chance Rain Showers | 7 to 10 mph NE | 34% |
| Monday Night | 58°F | Chance Rain Showers | 6 to 9 mph NE | 44% |
| Tuesday | 65°F | Rain Showers Likely | 13 mph NE | 61% |
| Tuesday Night | 55°F | Rain Showers Likely | 13 mph NE | 61% |
| Wednesday | 61°F | Chance Rain Showers | 14 mph NE | 51% |
| Wednesday Night | 55°F | Chance Showers And Thunderstorms | 13 mph NE | 47% |
| Thursday | 62°F | Chance Showers And Thunderstorms | 13 mph NE | 45% |
| Thursday Night | 53°F | Chance Showers And Thunderstorms | 7 to 12 mph N | 39% |
| Friday | 67°F | Slight Chance Rain Showers | 10 mph N | 19% |
| Friday Night | 52°F | Slight Chance Rain Showers | 6 to 10 mph N | 15% |
Forecast source: National Weather Service (api.weather.gov) for Fairfax (38.853, -77.299). Updated through the day.
Growing snapshot for Fairfax
Last spring frost
Apr 14
First fall frost
Oct 29
Growing season
198 days
Hardiness zone
7b
More local growing data for Fairfax: nearby ZIP 22032 weather · frost dates · planting calendar · Virginia frost dates
Nearby towns & communities
Annandale
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Belle Haven
Braddock
Bull Run
Burke
Burke Centre
Centreville
Chantilly
Clifton
Crosspointe
Difficult Run
Dranesville
Dunn Loring
Fair Lakes
Fair Oaks
Fairfax Station
Floris
Fort Belvoir
Fort Hunt
Franconia
Franklin Farm
George Mason
Great Falls
Great Falls Crossing
Greenbriar
Groveton
Hayfield
Herndon
Huntington
Climate data from the nearest NOAA station, Vienna, Va (5.2 mi from Fairfax). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.