Harman US

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

WhenTempForecastWindPrecip
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.