National Weather Service Forecast for: Petaluma CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 11:44 pm PST Feb 1, 2026
 
Overnight

Overnight: Areas of fog. Otherwise, mostly clear, with a low around 41. West wind around 5 mph.
Areas Fog

 Monday

Monday: Areas of fog before 10am. Otherwise, sunny, with a high near 65. West northwest wind 3 to 5 mph.
Areas Fog
then Sunny
 Monday
Night
Monday Night: Patchy fog after 10pm. Otherwise, partly cloudy, with a low around 41. Calm wind.
Patchy Fog

 Tuesday

Tuesday: Widespread fog, mainly before 7am. Otherwise, sunny, with a high near 67. East wind 3 to 6 mph.
Fog then
Sunny
 Tuesday
Night
Tuesday Night: Patchy fog after 10pm. Otherwise, mostly clear, with a low around 42. Calm wind.
Patchy Fog

 Wednesday

Wednesday: Sunny, with a high near 67.
Sunny

 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 43.
Mostly Clear

 Thursday

Thursday: Sunny, with a high near 65.
Sunny

 Thursday
Night
Thursday Night: Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 45.
Mostly Cloudy
then Patchy
Fog
Lo 41 °F Hi 65 °F Lo 41 °F Hi 67 °F Lo 42 °F Hi 67 °F Lo 43 °F Hi 65 °F Lo 45 °F

Coastal Flood Advisory
 

Overnight
 
 Areas of fog. Otherwise, mostly clear, with a low around 41. West wind around 5 mph.
Monday
 
 Areas of fog before 10am. Otherwise, sunny, with a high near 65. West northwest wind 3 to 5 mph.
Monday Night
 
 Patchy fog after 10pm. Otherwise, partly cloudy, with a low around 41. Calm wind.
Tuesday
 
 Widespread fog, mainly before 7am. Otherwise, sunny, with a high near 67. East wind 3 to 6 mph.
Tuesday Night
 
 Patchy fog after 10pm. Otherwise, mostly clear, with a low around 42. Calm wind.
Wednesday
 
 Sunny, with a high near 67.
Wednesday Night
 
 Mostly clear, with a low around 43.
Thursday
 
 Sunny, with a high near 65.
Thursday Night
 
 Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 45.
Friday
 
 Patchy fog before 9am. Otherwise, mostly sunny, with a high near 64.
Friday Night
 
 Patchy fog. Otherwise, partly cloudy, with a low around 45.
Saturday
 
 Areas of fog. Otherwise, mostly sunny, with a high near 64.
Saturday Night
 
 Patchy fog. Otherwise, partly cloudy, with a low around 46.
Sunday
 
 A slight chance of rain. Areas of fog. Otherwise, partly sunny, with a high near 64.

 

Forecast from NOAA-NWS for Petaluma CA.