National Weather Service Forecast for: Guerneville CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:40 am PST Dec 5, 2025
 
Overnight

Overnight: Areas of fog after 3am. Otherwise, mostly clear, with a low around 38. Calm wind.
Areas Fog

 Friday

Friday: Sunny, with a high near 61. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Sunny

 Friday
Night
Friday Night: Patchy dense fog between 4am and 5am. Otherwise, partly cloudy, with a low around 45. Calm wind becoming west southwest around 6 mph.
Mostly Clear
then Patchy
Dense Fog
 Saturday

Saturday: Patchy dense fog before 10am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 64. Calm wind becoming northwest 5 to 9 mph in the afternoon.
Patchy Dense
Fog then
Sunny
 Saturday
Night
Saturday Night: Mostly clear, with a low around 45. West northwest wind around 7 mph.
Mostly Clear

 Sunday

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

 Sunday
Night
Sunday Night: Partly cloudy, with a low around 46.
Partly Cloudy

 Monday

Monday: Patchy fog before 9am. Otherwise, sunny, with a high near 64.
Patchy Fog
then Sunny
 Monday
Night
Monday Night: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 46.
Partly Cloudy
then Patchy
Fog
Lo 38 °F Hi 61 °F Lo 45 °F Hi 64 °F Lo 45 °F Hi 64 °F Lo 46 °F Hi 64 °F Lo 46 °F

Coastal Flood Advisory
Cold Weather Advisory
 

Overnight
 
 Areas of fog after 3am. Otherwise, mostly clear, with a low around 38. Calm wind.
Friday
 
 Sunny, with a high near 61. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Friday Night
 
 Patchy dense fog between 4am and 5am. Otherwise, partly cloudy, with a low around 45. Calm wind becoming west southwest around 6 mph.
Saturday
 
 Patchy dense fog before 10am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 64. Calm wind becoming northwest 5 to 9 mph in the afternoon.
Saturday Night
 
 Mostly clear, with a low around 45. West northwest wind around 7 mph.
Sunday
 
 Mostly sunny, with a high near 64.
Sunday Night
 
 Partly cloudy, with a low around 46.
Monday
 
 Patchy fog before 9am. Otherwise, sunny, with a high near 64.
Monday Night
 
 Patchy fog after 2am. Otherwise, partly cloudy, with a low around 46.
Tuesday
 
 Patchy fog before 9am. Otherwise, mostly sunny, with a high near 66.
Tuesday Night
 
 Patchy fog. Otherwise, mostly cloudy, with a low around 49.
Wednesday
 
 Patchy fog. Otherwise, mostly sunny, with a high near 68.
Wednesday Night
 
 Patchy fog. Otherwise, mostly clear, with a low around 48.
Thursday
 
 Patchy fog. Otherwise, sunny, with a high near 67.

 

Forecast from NOAA-NWS for Guerneville CA.