Clearlake, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Clearlake, a city in Lake County, California.
This Afternoon
54°F
Chance Light Rain
A chance of rain. Mostly cloudy, with a high near 54. East northeast wind around 9 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Clearlake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 54°F | Chance Light Rain | 9 mph ENE | 40% |
| Tonight | 43°F | Chance Light Rain then Patchy Fog | 1 to 9 mph ENE | 40% |
| Wednesday | 65°F | Patchy Fog then Partly Sunny | 1 to 12 mph N | 0% |
| Wednesday Night | 41°F | Partly Cloudy | 6 to 12 mph NW | 0% |
| Thursday | 70°F | Sunny | 1 to 6 mph WNW | 0% |
| Thursday Night | 44°F | Mostly Clear | 1 mph WNW | 0% |
| Friday | 74°F | Sunny | 1 mph NNW | 0% |
| Friday Night | 46°F | Mostly Clear | 0 mph | 0% |
| Saturday | 75°F | Sunny | 2 mph SE | 0% |
| Saturday Night | 45°F | Mostly Clear | 1 mph W | 0% |
| Sunday | 72°F | Mostly Sunny | 2 mph W | 0% |
| Sunday Night | 45°F | Mostly Cloudy | 1 mph NW | 0% |
| Monday | 69°F | Partly Sunny | 2 mph WNW | 3% |
| Monday Night | 44°F | Partly Cloudy | 2 mph NW | 4% |
Forecast source: National Weather Service (api.weather.gov) for Clearlake (38.960, -122.633). Updated through the day.
Growing snapshot for Clearlake
Last spring frost
Apr 10
First fall frost
Nov 6
Growing season
209 days
Hardiness zone
9a
More local growing data for Clearlake: nearby ZIP 95422 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Clearlake Oaks
Clearlake Riviera
Cobb
Hidden Valley Lake
Kelseyville
Lakeport
Lower Lake
Lucerne
Middletown
Nice
North Lakeport
Soda Bay
Spring Valley
Upper Lake
Climate data from the nearest NOAA station, Clearlake 4 Se, Ca (5.9 mi from Clearlake). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.