Herndon, VA Weather & Growing Conditions
Tonight
61°F
Mostly Cloudy
Mostly cloudy, with a low around 61. North wind around 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Mostly Cloudy | 8 mph N | 10% |
| Saturday | 78°F | Partly Sunny | 8 mph E | 5% |
| Saturday Night | 66°F | Mostly Cloudy then Isolated Rain Showers | 8 mph SE | 20% |
| Sunday | 83°F | Chance Rain Showers | 7 to 13 mph S | 51% |
| Sunday Night | 65°F | Showers And Thunderstorms Likely | 3 to 9 mph NW | 64% |
| Monday | 74°F | Chance Rain Showers | 8 to 12 mph NE | 40% |
| Monday Night | 61°F | Rain Showers Likely | 7 to 10 mph NE | 57% |
| Tuesday | 66°F | Rain Showers Likely | 12 mph NE | 60% |
| Tuesday Night | 56°F | Rain Showers Likely | 12 mph NE | 60% |
| Wednesday | 62°F | Chance Rain Showers | 12 mph NE | 54% |
| Wednesday Night | 56°F | Chance Showers And Thunderstorms | 10 mph NE | 51% |
| Thursday | 63°F | Chance Showers And Thunderstorms | 10 mph NE | 50% |
| Thursday Night | 55°F | Chance Showers And Thunderstorms | 5 to 8 mph N | 35% |
| Friday | 68°F | Slight Chance Rain Showers | 10 mph N | 23% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Herndon, VA
Last spring frost
Apr 15
First fall frost
Oct 24
Growing season
194 days
Hardiness zone
7b
Explore more for Herndon, VA: full frost dates · planting calendar · Virginia frost dates
Climate data from the nearest NOAA station, Washington Dc Dulles Ap, Va (5.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.