National Weather Service Forecast for: Petaluma CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 5:12 am PDT Mar 19, 2026
 
Today

Today: Sunny, with a high near 90. Calm wind becoming west around 6 mph in the afternoon.
Sunny
 Tonight

Tonight: Mostly clear, with a low around 57. Light west northwest wind.
Mostly Clear
 Friday

Friday: Sunny, with a high near 88. Calm wind becoming west around 5 mph in the afternoon.
Sunny
 Friday
Night
Friday Night: Increasing clouds, with a low around 56. West wind around 6 mph.
Increasing
Clouds
 Saturday

Saturday: Partly sunny, with a high near 80. West northwest wind 5 to 10 mph, with gusts as high as 18 mph.
Partly Sunny
 Saturday
Night
Saturday Night: Mostly clear, with a low around 49.
Mostly Clear
 Sunday

Sunday: Mostly sunny, with a high near 78.
Mostly Sunny
 Sunday
Night
Sunday Night: Mostly clear, with a low around 47.
Mostly Clear
 Monday

Monday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 79.
Patchy Fog
then Sunny
Hi 90 °F Lo 57 °F Hi 88 °F Lo 56 °F Hi 80 °F Lo 49 °F Hi 78 °F Lo 47 °F Hi 79 °F

Heat Advisory
 

Today
 
 Sunny, with a high near 90. Calm wind becoming west around 6 mph in the afternoon.
Tonight
 
 Mostly clear, with a low around 57. Light west northwest wind.
Friday
 
 Sunny, with a high near 88. Calm wind becoming west around 5 mph in the afternoon.
Friday Night
 
 Increasing clouds, with a low around 56. West wind around 6 mph.
Saturday
 
 Partly sunny, with a high near 80. West northwest wind 5 to 10 mph, with gusts as high as 18 mph.
Saturday Night
 
 Mostly clear, with a low around 49.
Sunday
 
 Mostly sunny, with a high near 78.
Sunday Night
 
 Mostly clear, with a low around 47.
Monday
 
 Patchy fog before 8am. Otherwise, mostly sunny, with a high near 79.
Monday Night
 
 Mostly clear, with a low around 50.
Tuesday
 
 Sunny, with a high near 78.
Tuesday Night
 
 Mostly clear, with a low around 49.
Wednesday
 
 Sunny, with a high near 74.

 

Forecast from NOAA-NWS for Petaluma CA.