National Weather Service Forecast for: Guerneville CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 3:06 pm PST Nov 1, 2026
 
Tonight

Tonight: Partly cloudy, with a low around 46. Calm wind.
Partly Cloudy


 Monday

Monday: Mostly cloudy, with a high near 65. Calm wind becoming southwest around 5 mph in the afternoon.
Mostly Cloudy


 Monday
Night
Monday Night: A slight chance of showers before 2am, then a chance of showers after 3am. Mostly cloudy, with a low around 50. Calm wind. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Mostly Cloudy
then Chance
Showers

 Tuesday

Tuesday: Showers, mainly before 4pm. Patchy fog before 10am. High near 61. Calm wind becoming southeast around 6 mph in the morning. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Showers and
Patchy Fog

 Tuesday
Night
Tuesday Night: A 40 percent chance of showers before 10pm. Patchy fog before 10pm, then patchy fog after 1am. Otherwise, mostly cloudy, with a low around 47. Calm wind.
Chance
Showers and
Patchy Fog
then Patchy
Fog
 Wednesday

Wednesday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 67.
Patchy Fog
then Mostly
Sunny

 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 48.
Partly Cloudy


 Thursday

Thursday: Sunny, with a high near 69.
Sunny


 Thursday
Night
Thursday Night: Mostly clear, with a low around 48.
Mostly Clear
Lo 46 °F Hi 65 °F Lo 50 °F Hi 61 °F Lo 47 °F Hi 67 °F Lo 48 °F Hi 69 °F Lo 48 °F

 

Tonight
 
 Partly cloudy, with a low around 46. Calm wind.
Monday
 
 Mostly cloudy, with a high near 65. Calm wind becoming southwest around 5 mph in the afternoon.
Monday Night
 
 A slight chance of showers before 2am, then a chance of showers after 3am. Mostly cloudy, with a low around 50. Calm wind. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
 
 Showers, mainly before 4pm. Patchy fog before 10am. High near 61. Calm wind becoming southeast around 6 mph in the morning. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday Night
 
 A 40 percent chance of showers before 10pm. Patchy fog before 10pm, then patchy fog after 1am. Otherwise, mostly cloudy, with a low around 47. Calm wind.
Wednesday
 
 Patchy fog before 9am. Otherwise, mostly sunny, with a high near 67.
Wednesday Night
 
 Partly cloudy, with a low around 48.
Thursday
 
 Sunny, with a high near 69.
Thursday Night
 
 Mostly clear, with a low around 48.
Friday
 
 Mostly sunny, with a high near 72.
Friday Night
 
 Mostly clear, with a low around 50.
Saturday
 
 Sunny, with a high near 73.
Saturday Night
 
 Partly cloudy, with a low around 50.
Sunday
 
 Mostly sunny, with a high near 72.

 

Forecast from NOAA-NWS for Guerneville CA.