National Weather Service Forecast for: Clearlake CA
Issued by: National Weather Service Eureka, CA
Updated: 1:10 am PST Dec 5, 2025
 
Overnight

Overnight: Mostly clear, with a low around 37. Light north northwest wind.
Mostly Clear

 Friday

Friday: Sunny, with a high near 66. West northwest wind 3 to 5 mph.
Sunny

 Friday
Night
Friday Night: Patchy fog after 10pm. Otherwise, mostly clear, with a low around 41. Light and variable wind.
Patchy Fog

 Saturday

Saturday: Patchy fog before 10am. Otherwise, sunny, with a high near 65. Calm wind becoming west northwest 5 to 8 mph in the afternoon.
Patchy Fog
then Sunny
 Saturday
Night
Saturday Night: Mostly clear, with a low around 41. Light west northwest wind.
Mostly Clear

 Sunday

Sunday: Mostly sunny, with a high near 64. Calm wind.
Mostly Sunny

 Sunday
Night
Sunday Night: Patchy fog after 4am. Otherwise, partly cloudy, with a low around 41.
Partly Cloudy
then Patchy
Fog
 Monday

Monday: Patchy fog before 7am. Otherwise, mostly sunny, with a high near 67.
Patchy Fog
then Sunny
 Monday
Night
Monday Night: Partly cloudy, with a low around 42.
Partly Cloudy
Lo 37 °F Hi 66 °F Lo 41 °F Hi 65 °F Lo 41 °F Hi 64 °F Lo 41 °F Hi 67 °F Lo 42 °F

 

Overnight
 
 Mostly clear, with a low around 37. Light north northwest wind.
Friday
 
 Sunny, with a high near 66. West northwest wind 3 to 5 mph.
Friday Night
 
 Patchy fog after 10pm. Otherwise, mostly clear, with a low around 41. Light and variable wind.
Saturday
 
 Patchy fog before 10am. Otherwise, sunny, with a high near 65. Calm wind becoming west northwest 5 to 8 mph in the afternoon.
Saturday Night
 
 Mostly clear, with a low around 41. Light west northwest wind.
Sunday
 
 Mostly sunny, with a high near 64. Calm wind.
Sunday Night
 
 Patchy fog after 4am. Otherwise, partly cloudy, with a low around 41.
Monday
 
 Patchy fog before 7am. Otherwise, mostly sunny, with a high near 67.
Monday Night
 
 Partly cloudy, with a low around 42.
Tuesday
 
 Mostly sunny, with a high near 67.
Tuesday Night
 
 Patchy fog. Otherwise, partly cloudy, with a low around 44.
Wednesday
 
 Patchy fog. Otherwise, mostly sunny, with a high near 69.
Wednesday Night
 
 Patchy fog. Otherwise, mostly clear, with a low around 44.
Thursday
 
 Patchy fog. Otherwise, sunny, with a high near 70.

 

Forecast from NOAA-NWS for Clearlake CA.