National Weather Service Forecast for: Guerneville CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 11:55 pm PST Dec 22, 2025
 
Overnight

Overnight: Rain likely. Areas of dense fog. Otherwise, cloudy, with a steady temperature around 53. Light east wind. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Rain Likely
and Areas
Dense Fog

 Tuesday

Tuesday: Rain. Areas of fog before 10am. High near 56. South southeast wind 5 to 11 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Rain and
Areas Fog

 Tuesday
Night
Tuesday Night: Rain before 10pm, then showers and possibly a thunderstorm between 10pm and 4am, then rain likely and possibly a thunderstorm after 4am. Low around 48. Breezy, with a southeast wind 11 to 16 mph increasing to 17 to 22 mph after midnight. Winds could gust as high as 55 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Showers and
Breezy

 Wednesday

Wednesday: Rain, with thunderstorms also possible after 4pm. Some of the storms could be severe. Widespread dense fog, mainly before 9am. High near 54. Calm wind becoming southeast 5 to 9 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Rain and
Dense Fog
then Severe
T-Storms
and Areas Fog
 Wednesday
Night
Wednesday Night: Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 49. South southeast wind 11 to 14 mph, with gusts as high as 30 mph. 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%. New rainfall amounts between three quarters and one inch possible.
Showers


 Thursday
Night
Thursday Night: Showers and possibly a thunderstorm before 4am, then rain after 4am. Patchy fog after 4am. Low around 45. Chance of precipitation is 100%.
Showers and
Patchy Fog

 Friday

Friday: Rain before 10am, then showers and possibly a thunderstorm between 10am and 4pm, then rain likely and possibly a thunderstorm after 4pm. Areas of fog. Otherwise, cloudy, with a high near 51.
Showers and
Areas Fog

 Friday
Night
Friday Night: Rain likely, mainly before 10pm. Patchy fog before 7pm, then patchy fog after 4am. Otherwise, mostly cloudy, with a low around 41.
Rain Likely
and Patchy
Fog
Lo 53 °F Hi 56 °F Lo 48 °F Hi 54 °F Lo 49 °F Hi 51 °F Lo 45 °F Hi 51 °F Lo 41 °F

Flood Watch
Wind Advisory
 

Overnight
 
 Rain likely. Areas of dense fog. Otherwise, cloudy, with a steady temperature around 53. Light east wind. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
 
 Rain. Areas of fog before 10am. High near 56. South southeast wind 5 to 11 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday Night
 
 Rain before 10pm, then showers and possibly a thunderstorm between 10pm and 4am, then rain likely and possibly a thunderstorm after 4am. Low around 48. Breezy, with a southeast wind 11 to 16 mph increasing to 17 to 22 mph after midnight. Winds could gust as high as 55 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday
 
 Rain, with thunderstorms also possible after 4pm. Some of the storms could be severe. Widespread dense fog, mainly before 9am. High near 54. Calm wind becoming southeast 5 to 9 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 80%. 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. South southeast wind 11 to 14 mph, with gusts as high as 30 mph. 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%. New rainfall amounts between three quarters and one inch possible.
Thursday Night
 
 Showers and possibly a thunderstorm before 4am, then rain after 4am. Patchy fog after 4am. Low around 45. Chance of precipitation is 100%.
Friday
 
 Rain before 10am, then showers and possibly a thunderstorm between 10am and 4pm, then rain likely and possibly a thunderstorm after 4pm. Areas of fog. Otherwise, cloudy, with a high near 51.
Friday Night
 
 Rain likely, mainly before 10pm. Patchy fog before 7pm, then patchy fog after 4am. Otherwise, mostly cloudy, with a low around 41.
Saturday
 
 Patchy fog before noon. Otherwise, mostly sunny, with a high near 54.
Saturday Night
 
 Mostly clear, with a low around 38.
Sunday
 
 Sunny, with a high near 55.
Sunday Night
 
 Mostly clear, with a low around 39.
Monday
 
 Sunny, with a high near 56.

 

Forecast from NOAA-NWS for Guerneville CA.