Janesville, CA Weather & Growing Conditions
This Afternoon
56°F
Chance Light Rain
A chance of rain after 1pm. Mostly cloudy. High near 56, with temperatures falling to around 44 in the afternoon. Southwest wind 5 to 10 mph. Chance of precipitation is 40%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 56°F | Chance Light Rain | 5 to 10 mph SW | 40% |
| Tonight | 30°F | Slight Chance Light Rain then Partly Cloudy | 5 mph NW | 18% |
| Wednesday | 57°F | Mostly Sunny | 0 to 5 mph NE | 0% |
| Wednesday Night | 30°F | Partly Cloudy | 0 to 5 mph W | 0% |
| Thursday | 60°F | Sunny | 0 to 5 mph NE | 0% |
| Thursday Night | 31°F | Mostly Clear | 0 to 5 mph SW | 0% |
| Friday | 61°F | Mostly Sunny | 0 to 5 mph NE | 0% |
| Friday Night | 34°F | Mostly Clear | 0 mph | 0% |
| Saturday | 64°F | Sunny | 0 to 5 mph NE | 0% |
| Saturday Night | 33°F | Partly Cloudy | 0 to 5 mph SW | 0% |
| Sunday | 67°F | Mostly Sunny | 0 to 5 mph SW | 0% |
| Sunday Night | 35°F | Partly Cloudy | 0 to 5 mph SW | 0% |
| Monday | 66°F | Mostly Sunny | 0 to 5 mph SW | 3% |
| Monday Night | 35°F | Partly Cloudy | 0 to 5 mph SW | 3% |
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 (12.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.