Penn Valley, CA Weather & Growing Conditions
Tonight
59°F
Clear
Clear. Low around 59, with temperatures rising to around 61 overnight. East northeast wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 59°F | Clear | 5 mph ENE | 0% |
| Saturday | 85°F | Sunny | 5 mph SW | 0% |
| Saturday Night | 62°F | Partly Cloudy | 5 mph E | 0% |
| Sunday | 83°F | Partly Sunny | 5 mph SSW | 0% |
| Sunday Night | 60°F | Mostly Cloudy | 0 to 3 mph S | 0% |
| Monday | 84°F | Sunny | 0 to 5 mph W | 0% |
| Monday Night | 61°F | Mostly Clear | 0 to 5 mph ESE | 0% |
| Tuesday | 85°F | Sunny | 0 to 5 mph W | 0% |
| Tuesday Night | 62°F | Clear | 1 to 5 mph ESE | 0% |
| Wednesday | 90°F | Sunny | 5 mph W | 0% |
| Wednesday Night | 64°F | Mostly Clear | 5 mph E | 0% |
| Thursday | 92°F | Sunny | 5 mph S | 0% |
| Thursday Night | 66°F | Mostly Clear | 5 mph SE | 0% |
| Friday | 88°F | Sunny | 6 mph SSE | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Penn Valley, CA
Last spring frost
Apr 10
First fall frost
Nov 13
Growing season
215 days
Hardiness zone
9b
Explore more for Penn Valley, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Grass Valley #2, Ca (7.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.