National Weather Service Forecast for: Guerneville CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:26 pm PDT Mar 19, 2026
 
This
Afternoon
This Afternoon: Sunny, with a high near 91. Calm wind.
Sunny
 Tonight

Tonight: Clear, with a low around 60. Calm wind.
Clear
 Friday

Friday: Sunny, with a high near 91. Light and variable wind.
Sunny
 Friday
Night
Friday Night: Partly cloudy, with a low around 61. Light northwest wind.
Partly Cloudy
 Saturday

Saturday: Mostly sunny, with a high near 84. Northwest wind 3 to 7 mph.
Mostly Sunny
 Saturday
Night
Saturday Night: Mostly clear, with a low around 54.
Mostly Clear
 Sunday

Sunday: Sunny, with a high near 81.
Sunny
 Sunday
Night
Sunday Night: Mostly clear, with a low around 52.
Mostly Clear
 Monday

Monday: Mostly sunny, with a high near 79.
Mostly Sunny
Hi 91 °F Lo 60 °F Hi 91 °F Lo 61 °F Hi 84 °F Lo 54 °F Hi 81 °F Lo 52 °F Hi 79 °F

Heat Advisory
 

This Afternoon
 
 Sunny, with a high near 91. Calm wind.
Tonight
 
 Clear, with a low around 60. Calm wind.
Friday
 
 Sunny, with a high near 91. Light and variable wind.
Friday Night
 
 Partly cloudy, with a low around 61. Light northwest wind.
Saturday
 
 Mostly sunny, with a high near 84. Northwest wind 3 to 7 mph.
Saturday Night
 
 Mostly clear, with a low around 54.
Sunday
 
 Sunny, with a high near 81.
Sunday Night
 
 Mostly clear, with a low around 52.
Monday
 
 Mostly sunny, with a high near 79.
Monday Night
 
 Mostly clear, with a low around 53.
Tuesday
 
 Sunny, with a high near 79.
Tuesday Night
 
 Mostly clear, with a low around 52.
Wednesday
 
 Sunny, with a high near 75.

 

Forecast from NOAA-NWS for Guerneville CA.