National Weather Service Forecast for: Vallejo CA
Issued by: National Weather Service Sacramento, CA
Updated: 1:21 pm PST Feb 1, 2026
 
Overnight

Overnight: Areas of fog after 5am. Otherwise, mostly clear, with a low around 43. Calm wind.
Areas Fog
 Monday

Monday: Areas of fog before 9am. Otherwise, sunny, with a high near 65. Light and variable wind.
Areas Fog
then Sunny
 Monday
Night
Monday Night: Partly cloudy, with a low around 43. Calm wind.
Partly Cloudy
 Tuesday

Tuesday: Sunny, with a high near 67. East northeast wind 6 to 8 mph.
Sunny
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 43. Light northeast wind.
Mostly Clear
 Wednesday

Wednesday: Patchy fog before 7am. Otherwise, sunny, with a high near 67.
Patchy Fog
then Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 44.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 64.
Sunny
 Thursday
Night
Thursday Night: Mostly cloudy, with a low around 47.
Mostly Cloudy
Lo 43 °F Hi 65 °F Lo 43 °F Hi 67 °F Lo 43 °F Hi 67 °F Lo 44 °F Hi 64 °F Lo 47 °F

 

Overnight
 
 Areas of fog after 5am. Otherwise, mostly clear, with a low around 43. Calm wind.
Monday
 
 Areas of fog before 9am. Otherwise, sunny, with a high near 65. Light and variable wind.
Monday Night
 
 Partly cloudy, with a low around 43. Calm wind.
Tuesday
 
 Sunny, with a high near 67. East northeast wind 6 to 8 mph.
Tuesday Night
 
 Mostly clear, with a low around 43. Light northeast wind.
Wednesday
 
 Patchy fog before 7am. Otherwise, sunny, with a high near 67.
Wednesday Night
 
 Mostly clear, with a low around 44.
Thursday
 
 Sunny, with a high near 64.
Thursday Night
 
 Mostly cloudy, with a low around 47.
Friday
 
 Patchy fog before 8am. Otherwise, mostly sunny, with a high near 64.
Friday Night
 
 Widespread fog. Otherwise, partly cloudy, with a low around 47.
Saturday
 
 Widespread fog. Otherwise, mostly sunny, with a high near 64.
Saturday Night
 
 Partly cloudy, with a low around 48.
Sunday
 
 A slight chance of rain. Mostly sunny, with a high near 65.

 

Forecast from NOAA-NWS for Vallejo CA.