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

Overnight: Widespread dense fog before 4am, then widespread dense fog after 5am. Otherwise, mostly clear, with a low around 43. Calm wind.
Dense Fog

 Monday

Monday: Widespread dense fog before 7am. Otherwise, sunny, with a high near 66. Calm wind becoming south around 5 mph.
Dense Fog
then Sunny
 Monday
Night
Monday Night: Partly cloudy, with a low around 42. Calm wind.
Partly Cloudy

 Tuesday

Tuesday: Sunny, with a high near 66. Northeast wind 3 to 7 mph.
Sunny

 Tuesday
Night
Tuesday Night: Patchy fog before 3am, then patchy fog after 4am. Otherwise, mostly clear, with a low around 42. Calm wind.
Patchy Fog

 Wednesday

Wednesday: Patchy fog before 8am. Otherwise, sunny, with a high near 64.
Patchy Fog
then Sunny
 Wednesday
Night
Wednesday Night: Patchy fog before midnight, then patchy fog after 2am. Otherwise, mostly clear, with a low around 42.
Patchy Fog

 Thursday

Thursday: Areas of fog before 9am. Otherwise, mostly sunny, with a high near 65.
Areas Fog
then Sunny
 Thursday
Night
Thursday Night: Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 46.
Partly Cloudy
then Patchy
Fog
Lo 43 °F Hi 66 °F Lo 42 °F Hi 66 °F Lo 42 °F Hi 64 °F Lo 42 °F Hi 65 °F Lo 46 °F

 

Overnight
 
 Widespread dense fog before 4am, then widespread dense fog after 5am. Otherwise, mostly clear, with a low around 43. Calm wind.
Monday
 
 Widespread dense fog before 7am. Otherwise, sunny, with a high near 66. Calm wind becoming south around 5 mph.
Monday Night
 
 Partly cloudy, with a low around 42. Calm wind.
Tuesday
 
 Sunny, with a high near 66. Northeast wind 3 to 7 mph.
Tuesday Night
 
 Patchy fog before 3am, then patchy fog after 4am. Otherwise, mostly clear, with a low around 42. Calm wind.
Wednesday
 
 Patchy fog before 8am. Otherwise, sunny, with a high near 64.
Wednesday Night
 
 Patchy fog before midnight, then patchy fog after 2am. Otherwise, mostly clear, with a low around 42.
Thursday
 
 Areas of fog before 9am. Otherwise, mostly sunny, with a high near 65.
Thursday Night
 
 Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 46.
Friday
 
 Patchy fog before 8am. Otherwise, mostly sunny, with a high near 64.
Friday Night
 
 Widespread fog. Otherwise, partly cloudy, with a low around 46.
Saturday
 
 Widespread fog. Otherwise, mostly sunny, with a high near 64.
Saturday Night
 
 Partly cloudy, with a low around 46.
Sunday
 
 A slight chance of rain. Partly sunny, with a high near 64.

 

Forecast from NOAA-NWS for Fairfield CA.