National Weather Service Forecast for: Guerneville CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 9:46 am PDT May 4, 2026
 
Today

Today: A 50 percent chance of rain, mainly after 4pm. Mostly cloudy, with a high near 62. Calm wind becoming west southwest 5 to 7 mph in the afternoon. New precipitation amounts of less than a tenth of an inch possible.
Slight Chance
Rain then
Chance Rain
 Tonight

Tonight: Rain likely, mainly before midnight. Patchy fog after 2am. Otherwise, cloudy, with a low around 51. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Rain Likely
and Patchy
Fog
 Tuesday

Tuesday: Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 68. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Patchy Fog
then Mostly
Sunny
 Tuesday
Night
Tuesday Night: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 50. West wind 5 to 7 mph becoming calm in the evening.
Mostly Clear
then Patchy
Fog
 Wednesday

Wednesday: Sunny, with a high near 73. Calm wind becoming west southwest around 6 mph in the afternoon.
Sunny

 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 51.
Mostly Clear

 Thursday

Thursday: Mostly sunny, with a high near 74.
Mostly Sunny

 Thursday
Night
Thursday Night: Partly cloudy, with a low around 50.
Partly Cloudy

 Friday

Friday: Sunny, with a high near 78.
Sunny
Hi 62 °F Lo 51 °F Hi 68 °F Lo 50 °F Hi 73 °F Lo 51 °F Hi 74 °F Lo 50 °F Hi 78 °F

 

Today
 
 A 50 percent chance of rain, mainly after 4pm. Mostly cloudy, with a high near 62. Calm wind becoming west southwest 5 to 7 mph in the afternoon. New precipitation amounts of less than a tenth of an inch possible.
Tonight
 
 Rain likely, mainly before midnight. Patchy fog after 2am. Otherwise, cloudy, with a low around 51. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
 
 Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 68. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Tuesday Night
 
 Patchy fog after 3am. Otherwise, partly cloudy, with a low around 50. West wind 5 to 7 mph becoming calm in the evening.
Wednesday
 
 Sunny, with a high near 73. Calm wind becoming west southwest around 6 mph in the afternoon.
Wednesday Night
 
 Mostly clear, with a low around 51.
Thursday
 
 Mostly sunny, with a high near 74.
Thursday Night
 
 Partly cloudy, with a low around 50.
Friday
 
 Sunny, with a high near 78.
Friday Night
 
 Clear, with a low around 53.
Saturday
 
 Sunny, with a high near 85.
Saturday Night
 
 Mostly clear, with a low around 56.
Sunday
 
 Sunny, with a high near 87.

 

Forecast from NOAA-NWS for Guerneville CA.