Great Falls, VA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Great Falls, a community in Fairfax County, Virginia.
Today
86°F
Partly Sunny
Partly sunny, with a high near 86. East wind 3 to 7 mph.
7-day forecast for Great Falls
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Partly Sunny | 3 to 7 mph E | 2% |
| Tonight | 71°F | Slight Chance Showers And Thunderstorms | 2 to 7 mph E | 65% |
| Wednesday | 85°F | Showers And Thunderstorms Likely | 2 to 7 mph SE | 67% |
| Wednesday Night | 73°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 3 to 7 mph S | 55% |
| Thursday | 90°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 6 to 10 mph S | 19% |
| Thursday Night | 74°F | Slight Chance Showers And Thunderstorms | 5 to 9 mph SW | 20% |
| Friday | 90°F | Mostly Sunny then Chance Showers And Thunderstorms | 3 to 7 mph SW | 41% |
| Friday Night | 72°F | Chance Showers And Thunderstorms | 2 to 6 mph SW | 49% |
| Saturday | 88°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 6 mph SW | 53% |
| Saturday Night | 71°F | Chance Showers And Thunderstorms | 1 to 5 mph SW | 53% |
| Sunday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 6 mph W | 19% |
| Sunday Night | 73°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph SW | 19% |
| Monday | 91°F | Mostly Sunny | 2 to 7 mph W | 12% |
| Monday Night | 73°F | Partly Cloudy | 2 to 6 mph W | 14% |
Forecast source: National Weather Service (api.weather.gov) for Great Falls (39.012, -77.302). Updated through the day.
Growing snapshot for Great Falls
Last spring frost
Apr 14
First fall frost
Oct 29
Growing season
198 days
Hardiness zone
7b
More local growing data for Great Falls: nearby ZIP 22066 weather · frost dates · planting calendar · Virginia frost dates
Nearby towns & communities
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Climate data from the nearest NOAA station, Vienna, Va (8.3 mi from Great Falls). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.