Clearlake, CA Weather & Growing Conditions
Tonight
39°F
Partly Cloudy
Partly cloudy, with a low around 39. East northeast wind 2 to 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 39°F | Partly Cloudy | 2 to 6 mph ENE | 4% |
| Wednesday | 63°F | Mostly Sunny | 1 to 12 mph NNW | 0% |
| Wednesday Night | 40°F | Partly Cloudy | 6 to 12 mph WNW | 0% |
| Thursday | 70°F | Sunny | 2 to 8 mph WNW | 0% |
| Thursday Night | 43°F | Mostly Clear | 0 to 3 mph WNW | 0% |
| Friday | 72°F | Sunny | 2 mph NNW | 0% |
| Friday Night | 46°F | Mostly Clear | 0 mph | 0% |
| Saturday | 73°F | Sunny | 0 to 3 mph ESE | 0% |
| Saturday Night | 45°F | Mostly Clear | 2 mph NW | 0% |
| Sunday | 71°F | Mostly Sunny | 3 mph WNW | 0% |
| Sunday Night | 45°F | Mostly Cloudy | 1 mph NW | 0% |
| Monday | 68°F | Partly Sunny | 0 to 3 mph WNW | 3% |
| Monday Night | 43°F | Partly Cloudy | 2 mph WNW | 4% |
| Tuesday | 68°F | Mostly Sunny | 2 mph WSW | 14% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Clearlake, CA
Last spring frost
Apr 10
First fall frost
Nov 6
Growing season
209 days
Hardiness zone
9a
Explore more for Clearlake, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Clearlake 4 Se, Ca (5.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.