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

Today: A slight chance of rain before 2pm, then a chance of rain after 4pm. Mostly cloudy, with a high near 64. Calm wind becoming west 5 to 9 mph in the afternoon. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Mostly Cloudy
then Chance
Rain
 Tonight

Tonight: Rain, mainly before 2am. Low around 51. West wind 3 to 7 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Rain

 Tuesday

Tuesday: Cloudy through mid morning, then gradual clearing, with a high near 67. Light west wind increasing to 5 to 9 mph in the afternoon.
Gradual
Clearing
 Tuesday
Night
Tuesday Night: Patchy fog after 5am. Otherwise, increasing clouds, with a low around 50. West wind 5 to 9 mph becoming calm in the evening. Winds could gust as high as 18 mph.
Partly Cloudy
then Patchy
Fog
 Wednesday

Wednesday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 73. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Patchy Fog
then Sunny
 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 50.
Partly Cloudy

 Thursday

Thursday: Patchy fog before 10am. Otherwise, mostly sunny, with a high near 72.
Patchy Fog
then Sunny
 Thursday
Night
Thursday Night: Partly cloudy, with a low around 47.
Partly Cloudy

 Friday

Friday: Mostly sunny, with a high near 75.
Mostly Sunny
Hi 64 °F Lo 51 °F Hi 67 °F Lo 50 °F Hi 73 °F Lo 50 °F Hi 72 °F Lo 47 °F Hi 75 °F

 

Today
 
 A slight chance of rain before 2pm, then a chance of rain after 4pm. Mostly cloudy, with a high near 64. Calm wind becoming west 5 to 9 mph in the afternoon. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
 
 Rain, mainly before 2am. Low around 51. West wind 3 to 7 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
 
 Cloudy through mid morning, then gradual clearing, with a high near 67. Light west wind increasing to 5 to 9 mph in the afternoon.
Tuesday Night
 
 Patchy fog after 5am. Otherwise, increasing clouds, with a low around 50. West wind 5 to 9 mph becoming calm in the evening. Winds could gust as high as 18 mph.
Wednesday
 
 Patchy fog before 9am. Otherwise, mostly sunny, with a high near 73. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Wednesday Night
 
 Partly cloudy, with a low around 50.
Thursday
 
 Patchy fog before 10am. Otherwise, mostly sunny, with a high near 72.
Thursday Night
 
 Partly cloudy, with a low around 47.
Friday
 
 Mostly sunny, with a high near 75.
Friday Night
 
 Clear, with a low around 49.
Saturday
 
 Sunny, with a high near 83.
Saturday Night
 
 Patchy fog. Otherwise, clear, with a low around 52.
Sunday
 
 Sunny, with a high near 87.

 

Forecast from NOAA-NWS for Petaluma CA.