Clearlake, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Clearlake, a city in Lake County, California.
This Afternoon
64°F
Mostly Cloudy
Mostly cloudy. High near 64, with temperatures falling to around 60 in the afternoon. West northwest wind around 9 mph.
7-day forecast for Clearlake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 64°F | Mostly Cloudy | 9 mph WNW | 1% |
| Tonight | 41°F | Mostly Cloudy | 5 to 9 mph NW | 1% |
| Thursday | 71°F | Sunny | 0 to 6 mph NW | 0% |
| Thursday Night | 43°F | Partly Cloudy | 0 mph | 0% |
| Friday | 74°F | Mostly Sunny | 2 mph NNW | 0% |
| Friday Night | 46°F | Mostly Clear | 0 mph | 0% |
| Saturday | 74°F | Sunny | 2 mph E | 0% |
| Saturday Night | 44°F | Mostly Clear | 1 mph E | 0% |
| Sunday | 72°F | Mostly Sunny | 2 mph WNW | 0% |
| Sunday Night | 45°F | Partly Cloudy | 1 mph WNW | 0% |
| Monday | 70°F | Mostly Sunny | 2 mph WNW | 0% |
| Monday Night | 43°F | Partly Cloudy | 1 mph NW | 1% |
| Tuesday | 71°F | Sunny | 2 mph WNW | 3% |
| Tuesday Night | 44°F | Partly Cloudy then Patchy Fog | 1 mph WNW | 14% |
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 5, 2026.