National Weather Service Forecast for: Petaluma CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 8:57 am PDT Oct 6, 2026
 
Today

Today: Sunny and hot, with a high near 96. Calm wind becoming west 5 to 7 mph in the afternoon.
Hot
 Tonight

Tonight: Mostly clear, with a low around 56. Light west wind.
Mostly Clear
 Wednesday

Wednesday: Sunny, with a high near 94. Calm wind becoming west around 6 mph in the afternoon.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 53. West wind 5 to 7 mph becoming calm in the evening.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 93. Calm wind.
Sunny
 Thursday
Night
Thursday Night: Mostly clear, with a low around 56.
Mostly Clear
 Friday

Friday: Sunny, with a high near 87.
Sunny
 Friday
Night
Friday Night: Partly cloudy, with a low around 53.
Partly Cloudy
 Saturday

Saturday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 77.
Patchy Fog
then Sunny
Hi 96 °F Lo 56 °F Hi 94 °F Lo 53 °F Hi 93 °F Lo 56 °F Hi 87 °F Lo 53 °F Hi 77 °F

Heat Advisory
Coastal Flood Advisory
 

Today
 
 Sunny and hot, with a high near 96. Calm wind becoming west 5 to 7 mph in the afternoon.
Tonight
 
 Mostly clear, with a low around 56. Light west wind.
Wednesday
 
 Sunny, with a high near 94. Calm wind becoming west around 6 mph in the afternoon.
Wednesday Night
 
 Mostly clear, with a low around 53. West wind 5 to 7 mph becoming calm in the evening.
Thursday
 
 Sunny, with a high near 93. Calm wind.
Thursday Night
 
 Mostly clear, with a low around 56.
Friday
 
 Sunny, with a high near 87.
Friday Night
 
 Partly cloudy, with a low around 53.
Saturday
 
 Patchy fog before 9am. Otherwise, mostly sunny, with a high near 77.
Saturday Night
 
 Mostly clear, with a low around 49.
Sunday
 
 Sunny, with a high near 76.
Sunday Night
 
 Mostly clear, with a low around 49.
Columbus Day
 
 Sunny, with a high near 79.

 

Forecast from NOAA-NWS for Petaluma CA.