Johnsville, CA Weather & Growing Conditions
Tonight
41°F
Clear
Clear, with a low around 41. Southeast wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 41°F | Clear | 0 to 5 mph SE | 0% |
| Saturday | 80°F | Sunny | 0 to 5 mph E | 0% |
| Saturday Night | 43°F | Partly Cloudy | 0 to 5 mph SE | 0% |
| Sunday | 81°F | Partly Sunny then Patchy Smoke | 0 to 5 mph SE | 0% |
| Sunday Night | 44°F | Mostly Cloudy | 0 mph | 0% |
| Monday | 82°F | Mostly Sunny | 0 mph | 0% |
| Monday Night | 44°F | Mostly Clear | 0 mph | 0% |
| Tuesday | 83°F | Sunny | 0 to 5 mph NE | 1% |
| Tuesday Night | 45°F | Mostly Clear | 0 to 5 mph SE | 0% |
| Wednesday | 84°F | Sunny | 0 to 5 mph S | 0% |
| Wednesday Night | 47°F | Mostly Clear | 0 to 5 mph S | 0% |
| Thursday | 83°F | Sunny | 0 to 5 mph S | 0% |
| Thursday Night | 47°F | Partly Cloudy | 0 to 5 mph S | 1% |
| Friday | 78°F | Mostly Sunny | 0 to 5 mph S | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Johnsville, CA
Last spring frost
Jun 11
First fall frost
Sep 10
Growing season
91 days
Hardiness zone
7a
Explore more for Johnsville, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Portola, Ca (10.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.