National Weather Service Forecast for: Petaluma CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:24 pm PST Dec 17, 2025
 
Tonight

Tonight: Widespread dense fog, mainly after 11pm. Otherwise, increasing clouds, with a low around 45. Light west wind.
Dense Fog

 Thursday

Thursday: A 30 percent chance of rain after 4pm. Widespread fog, mainly before 11am. Otherwise, mostly cloudy, with a high near 57. Light and variable wind.
Fog then
Chance Rain
and Patchy
Fog
 Thursday
Night
Thursday Night: Rain likely, mainly after 10pm. Patchy fog. Otherwise, cloudy, with a low around 50. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Rain Likely
and Patchy
Fog
 Friday

Friday: Rain. High near 56. South wind 6 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Rain

 Friday
Night
Friday Night: Rain, mainly before 10pm. Patchy fog after 4am. Low around 50. West southwest wind 3 to 7 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain then
Chance Rain
and Patchy
Fog
 Saturday

Saturday: Rain, mainly after 10am. Patchy fog before 10am. High near 54. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Rain and
Patchy Fog

 Saturday
Night
Saturday Night: Rain before 10pm, then showers and possibly a thunderstorm after 10pm. Low around 51. Chance of precipitation is 90%.
Showers

 Sunday

Sunday: Showers and possibly a thunderstorm. Cloudy, with a high near 57.
Showers

 Sunday
Night
Sunday Night: Rain. Cloudy, with a low around 49.
Rain
Lo 45 °F Hi 57 °F Lo 50 °F Hi 56 °F Lo 50 °F Hi 54 °F Lo 51 °F Hi 57 °F Lo 49 °F

 

Tonight
 
 Widespread dense fog, mainly after 11pm. Otherwise, increasing clouds, with a low around 45. Light west wind.
Thursday
 
 A 30 percent chance of rain after 4pm. Widespread fog, mainly before 11am. Otherwise, mostly cloudy, with a high near 57. Light and variable wind.
Thursday Night
 
 Rain likely, mainly after 10pm. Patchy fog. Otherwise, cloudy, with a low around 50. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
 
 Rain. High near 56. South wind 6 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
 
 Rain, mainly before 10pm. Patchy fog after 4am. Low around 50. West southwest wind 3 to 7 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
 
 Rain, mainly after 10am. Patchy fog before 10am. High near 54. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
 
 Rain before 10pm, then showers and possibly a thunderstorm after 10pm. Low around 51. Chance of precipitation is 90%.
Sunday
 
 Showers and possibly a thunderstorm. Cloudy, with a high near 57.
Sunday Night
 
 Rain. Cloudy, with a low around 49.
Monday
 
 Rain likely. Mostly cloudy, with a high near 55.
Monday Night
 
 Rain likely. Cloudy, with a low around 45.
Tuesday
 
 Rain likely. Mostly cloudy, with a high near 52.
Tuesday Night
 
 Rain. Cloudy, with a low around 46.
Wednesday
 
 Rain likely. Cloudy, with a high near 54.

 

Forecast from NOAA-NWS for Petaluma CA.