National Weather Service Forecast for: Guerneville CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 7:35 pm PST Dec 4, 2025
 
Overnight

Overnight: Mostly clear, with a low around 44. Calm wind.
Mostly Clear

 Friday

Friday: Sunny, with a high near 63. Calm wind becoming southwest around 6 mph in the afternoon.
Sunny

 Friday
Night
Friday Night: Patchy dense fog after 4am. Otherwise, partly cloudy, with a low around 47. Light and variable wind.
Partly Cloudy
then Patchy
Dense Fog
 Saturday

Saturday: Patchy dense fog before 7am. Otherwise, sunny, with a high near 65. Calm wind becoming north northwest 5 to 7 mph in the morning.
Patchy Dense
Fog then
Sunny
 Saturday
Night
Saturday Night: Partly cloudy, with a low around 47. West wind around 5 mph becoming calm in the evening.
Partly Cloudy

 Sunday

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

 Sunday
Night
Sunday Night: Patchy fog after 4am. Otherwise, partly cloudy, with a low around 46.
Partly Cloudy
then Patchy
Fog
 Monday

Monday: Patchy fog before 10am. Otherwise, mostly sunny, with a high near 65.
Patchy Fog
then Mostly
Sunny
 Monday
Night
Monday Night: Partly cloudy, with a low around 47.
Partly Cloudy
Lo 44 °F Hi 63 °F Lo 47 °F Hi 65 °F Lo 47 °F Hi 64 °F Lo 46 °F Hi 65 °F Lo 47 °F

Coastal Flood Advisory
 

Overnight
 
 Mostly clear, with a low around 44. Calm wind.
Friday
 
 Sunny, with a high near 63. Calm wind becoming southwest around 6 mph in the afternoon.
Friday Night
 
 Patchy dense fog after 4am. Otherwise, partly cloudy, with a low around 47. Light and variable wind.
Saturday
 
 Patchy dense fog before 7am. Otherwise, sunny, with a high near 65. Calm wind becoming north northwest 5 to 7 mph in the morning.
Saturday Night
 
 Partly cloudy, with a low around 47. West wind around 5 mph becoming calm in the evening.
Sunday
 
 Partly sunny, with a high near 64.
Sunday Night
 
 Patchy fog after 4am. Otherwise, partly cloudy, with a low around 46.
Monday
 
 Patchy fog before 10am. Otherwise, mostly sunny, with a high near 65.
Monday Night
 
 Partly cloudy, with a low around 47.
Tuesday
 
 Mostly sunny, with a high near 66.
Tuesday Night
 
 Mostly cloudy, with a low around 49.
Wednesday
 
 Patchy fog. Otherwise, mostly sunny, with a high near 67.
Wednesday Night
 
 Patchy fog. Otherwise, partly cloudy, with a low around 49.
Thursday
 
 Patchy fog. Otherwise, sunny, with a high near 66.

 

Forecast from NOAA-NWS for Guerneville CA.