National Weather Service Forecast for: Guerneville CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 2:07 am PDT Sep 13, 2026
 
Overnight

Overnight: Mostly clear, with a low around 53. West wind around 5 mph.
Mostly Clear
 Sunday

Sunday: Sunny, with a high near 76. Northwest wind 5 to 11 mph, with gusts as high as 23 mph.
Sunny
 Sunday
Night
Sunday Night: Clear, with a low around 53. Northwest wind 5 to 10 mph becoming light west after midnight. Winds could gust as high as 23 mph.
Clear
 Monday

Monday: Sunny, with a high near 82. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Sunny
 Monday
Night
Monday Night: Mostly clear, with a low around 52. West wind 5 to 7 mph becoming calm in the evening.
Mostly Clear
 Tuesday

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

Wednesday: Patchy fog before 9am. Otherwise, sunny, with a high near 78.
Patchy Fog
then Sunny
 Wednesday
Night
Wednesday Night: Patchy fog between 10pm and 3am. Otherwise, mostly clear, with a low around 53.
Patchy Fog
Lo 53 °F Hi 76 °F Lo 53 °F Hi 82 °F Lo 52 °F Hi 81 °F Lo 52 °F Hi 78 °F Lo 53 °F

 

Overnight
 
 Mostly clear, with a low around 53. West wind around 5 mph.
Sunday
 
 Sunny, with a high near 76. Northwest wind 5 to 11 mph, with gusts as high as 23 mph.
Sunday Night
 
 Clear, with a low around 53. Northwest wind 5 to 10 mph becoming light west after midnight. Winds could gust as high as 23 mph.
Monday
 
 Sunny, with a high near 82. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Monday Night
 
 Mostly clear, with a low around 52. West wind 5 to 7 mph becoming calm in the evening.
Tuesday
 
 Sunny, with a high near 81.
Tuesday Night
 
 Mostly clear, with a low around 52.
Wednesday
 
 Patchy fog before 9am. Otherwise, sunny, with a high near 78.
Wednesday Night
 
 Patchy fog between 10pm and 3am. Otherwise, mostly clear, with a low around 53.
Thursday
 
 Patchy fog between 7am and 9am. Otherwise, mostly sunny, with a high near 76.
Thursday Night
 
 Patchy fog. Otherwise, mostly clear, with a low around 53.
Friday
 
 Patchy fog. Otherwise, mostly sunny, with a high near 76.
Friday Night
 
 Mostly clear, with a low around 53.
Saturday
 
 Mostly sunny, with a high near 77.

 

Forecast from NOAA-NWS for Guerneville CA.