National Weather Service Forecast for: Guerneville CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 12:28 pm PST Dec 16, 2025
 
This
Afternoon
This Afternoon: Rain likely, mainly after 4pm. Widespread fog, mainly after 5pm. Otherwise, cloudy, with a steady temperature around 54. Calm wind. Chance of precipitation is 60%.
Rain Likely
and Fog

 Tonight

Tonight: Rain. Widespread fog, mainly before 10pm. Low around 53. Calm wind. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain and Fog

 Wednesday

Wednesday: Rain likely, mainly before 10am. Patchy fog before 10am, then patchy fog after 5pm. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 62. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Rain Likely
and Patchy
Fog
 Wednesday
Night
Wednesday Night: A 10 percent chance of rain after 4am. Widespread dense fog, mainly after 3am. Otherwise, partly cloudy, with a low around 45. Calm wind.
Areas Fog
then Slight
Chance Rain
and Dense Fog
 Thursday

Thursday: A 40 percent chance of rain, mainly after 10am. Widespread fog, mainly before 10am. Otherwise, mostly cloudy, with a high near 58. Calm wind.
Chance Rain
and Fog

 Thursday
Night
Thursday Night: Rain likely. Widespread fog, mainly after 1am. Otherwise, cloudy, with a low around 51. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Rain Likely
and Fog

 Friday

Friday: Rain. Widespread dense fog, mainly before 7am. High near 57. Chance of precipitation is 80%.
Rain and
Dense Fog

 Friday
Night
Friday Night: Rain. Patchy fog after 10pm. Otherwise, cloudy, with a low around 53.
Rain and
Patchy Fog

 Saturday

Saturday: Rain likely. Areas of fog before 10am. Otherwise, cloudy, with a high near 58.
Rain Likely
and Areas Fog
Hi 54 °F Lo 53 °F Hi 62 °F Lo 45 °F Hi 58 °F Lo 51 °F Hi 57 °F Lo 53 °F Hi 58 °F

 

This Afternoon
 
 Rain likely, mainly after 4pm. Widespread fog, mainly after 5pm. Otherwise, cloudy, with a steady temperature around 54. Calm wind. Chance of precipitation is 60%.
Tonight
 
 Rain. Widespread fog, mainly before 10pm. Low around 53. Calm wind. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
 
 Rain likely, mainly before 10am. Patchy fog before 10am, then patchy fog after 5pm. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 62. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
 
 A 10 percent chance of rain after 4am. Widespread dense fog, mainly after 3am. Otherwise, partly cloudy, with a low around 45. Calm wind.
Thursday
 
 A 40 percent chance of rain, mainly after 10am. Widespread fog, mainly before 10am. Otherwise, mostly cloudy, with a high near 58. Calm wind.
Thursday Night
 
 Rain likely. Widespread fog, mainly after 1am. Otherwise, cloudy, with a low around 51. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Friday
 
 Rain. Widespread dense fog, mainly before 7am. High near 57. Chance of precipitation is 80%.
Friday Night
 
 Rain. Patchy fog after 10pm. Otherwise, cloudy, with a low around 53.
Saturday
 
 Rain likely. Areas of fog before 10am. Otherwise, cloudy, with a high near 58.
Saturday Night
 
 Rain. The rain could be heavy at times. Patchy fog. Otherwise, cloudy, with a low around 53.
Sunday
 
 Rain. The rain could be heavy at times. Patchy fog. Otherwise, cloudy, with a high near 57.
Sunday Night
 
 Rain. Patchy fog. Otherwise, cloudy, with a low around 51.
Monday
 
 Rain likely. Patchy fog. Otherwise, cloudy, with a high near 56.

 

Forecast from NOAA-NWS for Guerneville CA.