Janesville, CA Weather & Growing Conditions
This Afternoon
57°F
Slight Chance Light Rain
A slight chance of rain. Mostly cloudy. High near 57, with temperatures falling to around 47 in the afternoon. West wind around 5 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 57°F | Slight Chance Light Rain | 5 mph W | 19% |
| Tonight | 30°F | Slight Chance Light Rain then Partly Cloudy | 5 mph W | 19% |
| Wednesday | 57°F | Mostly Sunny | 0 to 5 mph S | 0% |
| Wednesday Night | 31°F | Partly Cloudy | 0 to 5 mph W | 0% |
| Thursday | 61°F | Sunny | 0 to 5 mph N | 0% |
| Thursday Night | 31°F | Mostly Clear | 0 mph | 0% |
| Friday | 61°F | Mostly Sunny | 0 mph | 0% |
| Friday Night | 33°F | Mostly Clear | 0 mph | 0% |
| Saturday | 64°F | Sunny | 0 to 5 mph SE | 0% |
| Saturday Night | 32°F | Partly Cloudy | 0 to 5 mph SW | 0% |
| Sunday | 67°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 SW | 2% |
| Monday Night | 34°F | Partly Cloudy | 0 to 5 mph W | 2% |
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.