Clearlake, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Clearlake, a city in Lake County, California.
Overnight
63°F
Mostly Clear
Mostly clear. Low around 63, with temperatures rising to around 67 overnight. North northeast wind around 2 mph.
7-day forecast for Clearlake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Mostly Clear | 2 mph NNE | 0% |
| Tuesday | 103°F | Sunny | 2 to 9 mph SE | 0% |
| Tuesday Night | 64°F | Mostly Clear | 0 to 6 mph W | 0% |
| Wednesday | 101°F | Sunny | 0 to 10 mph ESE | 0% |
| Wednesday Night | 62°F | Clear | 0 to 7 mph SSW | 0% |
| Thursday | 100°F | Sunny | 0 to 6 mph S | 0% |
| Thursday Night | 64°F | Mostly Clear | 0 to 6 mph W | 0% |
| Friday | 102°F | Sunny | 0 to 7 mph S | 0% |
| Friday Night | 66°F | Clear | 0 to 7 mph W | 0% |
| Saturday | 103°F | Sunny | 0 to 8 mph WSW | 0% |
| Saturday Night | 65°F | Mostly Clear | 1 to 8 mph W | 0% |
| Sunday | 100°F | Sunny | 1 to 8 mph NW | 0% |
| Sunday Night | 61°F | Clear | 0 to 8 mph W | 0% |
| Monday | 95°F | Sunny | 0 to 7 mph ESE | 0% |
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 Aug 4, 2026.