National Weather Service Forecast for: Petaluma CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 12:26 am PST Dec 5, 2025
 
Overnight

Overnight: Patchy fog between 3am and 5am. Otherwise, partly cloudy, with a low around 40. Calm wind.
Patchy Fog

 Friday

Friday: Patchy fog between 7am and 9am. Otherwise, sunny, with a high near 63. Calm wind becoming west northwest around 6 mph in the afternoon.
Patchy Fog
then Sunny
 Friday
Night
Friday Night: Patchy fog after 4am. Otherwise, partly cloudy, with a low around 45. Calm wind.
Partly Cloudy
then Patchy
Fog
 Saturday

Saturday: Patchy fog before 10am. Otherwise, mostly sunny, with a high near 64. Calm wind becoming northwest around 5 mph in the afternoon.
Patchy Fog
then Sunny
 Saturday
Night
Saturday Night: Partly cloudy, with a low around 45. West wind around 5 mph.
Partly Cloudy

 Sunday

Sunday: Partly sunny, with a high near 64.
Partly Sunny

 Sunday
Night
Sunday Night: Patchy fog after 1am. Otherwise, partly cloudy, with a low around 44.
Partly Cloudy
then Patchy
Fog
 Monday

Monday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 64.
Patchy Fog
then Mostly
Sunny
 Monday
Night
Monday Night: Patchy fog. Otherwise, partly cloudy, with a low around 44.
Patchy Fog
Lo 40 °F Hi 63 °F Lo 45 °F Hi 64 °F Lo 45 °F Hi 64 °F Lo 44 °F Hi 64 °F Lo 44 °F

Coastal Flood Advisory
 

Overnight
 
 Patchy fog between 3am and 5am. Otherwise, partly cloudy, with a low around 40. Calm wind.
Friday
 
 Patchy fog between 7am and 9am. Otherwise, sunny, with a high near 63. Calm wind becoming west northwest around 6 mph in the afternoon.
Friday Night
 
 Patchy fog after 4am. Otherwise, partly cloudy, with a low around 45. Calm wind.
Saturday
 
 Patchy fog before 10am. Otherwise, mostly sunny, with a high near 64. Calm wind becoming northwest around 5 mph in the afternoon.
Saturday Night
 
 Partly cloudy, with a low around 45. West wind around 5 mph.
Sunday
 
 Partly sunny, with a high near 64.
Sunday Night
 
 Patchy fog after 1am. Otherwise, partly cloudy, with a low around 44.
Monday
 
 Patchy fog before 11am. Otherwise, mostly sunny, with a high near 64.
Monday Night
 
 Patchy fog. Otherwise, partly cloudy, with a low around 44.
Tuesday
 
 Patchy fog before 10am. Otherwise, partly sunny, with a high near 65.
Tuesday Night
 
 Patchy fog. Otherwise, mostly cloudy, with a low around 46.
Wednesday
 
 Patchy fog. Otherwise, mostly sunny, with a high near 67.
Wednesday Night
 
 Patchy fog. Otherwise, partly cloudy, with a low around 46.
Thursday
 
 Patchy fog. Otherwise, mostly sunny, with a high near 66.

 

Forecast from NOAA-NWS for Petaluma CA.