Janesville, CA Weather & Growing Conditions
Tonight
30°F
Mostly Clear
Mostly clear, with a low around 30. Northwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 30°F | Mostly Clear | 5 mph NW | 1% |
| Wednesday | 57°F | Sunny | 0 to 5 mph SW | 1% |
| Wednesday Night | 31°F | Partly Cloudy | 0 to 5 mph NW | 1% |
| Thursday | 60°F | Sunny | 0 to 5 mph NE | 0% |
| Thursday Night | 29°F | Mostly Clear | 0 mph | 0% |
| Friday | 61°F | Mostly Sunny | 0 to 5 mph SE | 0% |
| Friday Night | 32°F | Mostly Clear | 0 mph | 0% |
| Saturday | 63°F | Sunny | 0 to 5 mph E | 0% |
| Saturday Night | 32°F | Partly Cloudy | 0 to 5 mph S | 0% |
| Sunday | 66°F | Mostly Sunny | 0 to 5 mph S | 0% |
| Sunday Night | 34°F | Partly Cloudy | 0 to 5 mph SW | 0% |
| Monday | 65°F | Partly Sunny | 0 to 5 mph S | 1% |
| Monday Night | 33°F | Partly Cloudy | 0 to 5 mph SW | 1% |
| Tuesday | 65°F | Mostly Sunny | 0 to 5 mph S | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Janesville, CA
Last spring frost
May 16
First fall frost
Oct 8
Growing season
143 days
Hardiness zone
7a
Explore more for Janesville, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Susanville 2Sw, Ca (14.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.