Grass Valley, CA Weather & Growing Conditions
Today
83°F
Sunny
Sunny. High near 83, with temperatures falling to around 81 in the afternoon. West southwest wind 1 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Sunny | 1 to 5 mph WSW | 0% |
| Tonight | 57°F | Partly Cloudy | 0 to 3 mph NE | 0% |
| Sunday | 82°F | Mostly Cloudy | 2 mph SSE | 0% |
| Sunday Night | 59°F | Mostly Cloudy | 1 mph NE | 0% |
| Monday | 82°F | Sunny | 3 mph W | 0% |
| Monday Night | 56°F | Mostly Clear | 2 mph ENE | 0% |
| Tuesday | 82°F | Sunny | 0 to 3 mph W | 0% |
| Tuesday Night | 57°F | Mostly Clear | 2 mph ENE | 0% |
| Wednesday | 87°F | Sunny | 3 mph WSW | 0% |
| Wednesday Night | 59°F | Mostly Clear | 3 mph E | 0% |
| Thursday | 89°F | Sunny | 3 mph SSE | 0% |
| Thursday Night | 60°F | Mostly Clear | 3 mph ESE | 1% |
| Friday | 84°F | Sunny | 5 mph ESE | 1% |
| Friday Night | 58°F | Partly Cloudy | 3 mph SE | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grass Valley, CA
Last spring frost
Apr 14
First fall frost
Nov 20
Growing season
218 days
Hardiness zone
9a
Explore more for Grass Valley, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Nevada City, Ca (3.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.