National Weather Service Forecast for: Guerneville CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 2:54 pm PST Dec 22, 2025
 
This
Afternoon
This Afternoon: A 40 percent chance of rain. Patchy fog after 4pm. Otherwise, cloudy, with a high near 56. Light west wind. New precipitation amounts of less than a tenth of an inch possible.
Chance Rain
and Patchy
Fog
 Tonight

Tonight: Rain. Patchy fog. Low around 50. Calm wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain and
Patchy Fog
 Tuesday

Tuesday: Rain. High near 55. South southeast wind 6 to 14 mph, with gusts as high as 34 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Rain

 Tuesday
Night
Tuesday Night: Rain and possibly a thunderstorm. Low around 47. Southeast wind 13 to 16 mph, with gusts as high as 39 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Rain

 Wednesday

Wednesday: Rain, with thunderstorms also possible after 4pm. High near 55. Southwest wind 5 to 9 mph becoming southeast in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Rain

 Wednesday
Night
Wednesday Night: Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 49. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Severe
T-Storms
 Christmas
Day
Christmas Day: Showers and possibly a thunderstorm. High near 51. Chance of precipitation is 100%.
Showers

 Thursday
Night
Thursday Night: Rain. Cloudy, with a low around 46.
Rain

 Friday

Friday: Rain. Mostly cloudy, with a high near 51.
Rain
Hi 56 °F Lo 50 °F Hi 55 °F Lo 47 °F Hi 55 °F Lo 49 °F Hi 51 °F Lo 46 °F Hi 51 °F

Flood Watch
High Wind Watch
 

This Afternoon
 
 A 40 percent chance of rain. Patchy fog after 4pm. Otherwise, cloudy, with a high near 56. Light west wind. New precipitation amounts of less than a tenth of an inch possible.
Tonight
 
 Rain. Patchy fog. Low around 50. Calm wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday
 
 Rain. High near 55. South southeast wind 6 to 14 mph, with gusts as high as 34 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Tuesday Night
 
 Rain and possibly a thunderstorm. Low around 47. Southeast wind 13 to 16 mph, with gusts as high as 39 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Wednesday
 
 Rain, with thunderstorms also possible after 4pm. High near 55. Southwest wind 5 to 9 mph becoming southeast in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
 
 Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 49. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Christmas Day
 
 Showers and possibly a thunderstorm. High near 51. Chance of precipitation is 100%.
Thursday Night
 
 Rain. Cloudy, with a low around 46.
Friday
 
 Rain. Mostly cloudy, with a high near 51.
Friday Night
 
 A chance of rain. Mostly cloudy, with a low around 41.
Saturday
 
 Sunny, with a high near 54.
Saturday Night
 
 Mostly clear, with a low around 38.
Sunday
 
 Sunny, with a high near 55.
Sunday Night
 
 Partly cloudy, with a low around 38.
Monday
 
 Mostly sunny, with a high near 55.

 

Forecast from NOAA-NWS for Guerneville CA.