National Weather Service Forecast for: Fullerton CA
Issued by: National Weather Service San Diego, CA
Updated: 8:48 pm PST Nov 1, 2026
 
Tonight

Tonight: Mostly clear, with a low around 54. Calm wind becoming northeast around 5 mph after midnight.
Mostly Clear
 Monday

Monday: Sunny, with a high near 76. East wind around 5 mph becoming calm.
Sunny
 Monday
Night
Monday Night: Partly cloudy, with a low around 55. Calm wind.
Partly Cloudy
 Tuesday

Tuesday: Sunny, with a high near 75. Calm wind becoming west around 5 mph in the afternoon.
Sunny
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 55. Calm wind becoming east around 5 mph.
Mostly Clear
 Wednesday

Wednesday: Sunny, with a high near 76.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 56.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 78.
Sunny
 Thursday
Night
Thursday Night: Mostly clear, with a low around 57.
Mostly Clear
Lo 54 °F Hi 76 °F Lo 55 °F Hi 75 °F Lo 55 °F Hi 76 °F Lo 56 °F Hi 78 °F Lo 57 °F

 

Tonight
 
 Mostly clear, with a low around 54. Calm wind becoming northeast around 5 mph after midnight.
Monday
 
 Sunny, with a high near 76. East wind around 5 mph becoming calm.
Monday Night
 
 Partly cloudy, with a low around 55. Calm wind.
Tuesday
 
 Sunny, with a high near 75. Calm wind becoming west around 5 mph in the afternoon.
Tuesday Night
 
 Mostly clear, with a low around 55. Calm wind becoming east around 5 mph.
Wednesday
 
 Sunny, with a high near 76.
Wednesday Night
 
 Mostly clear, with a low around 56.
Thursday
 
 Sunny, with a high near 78.
Thursday Night
 
 Mostly clear, with a low around 57.
Friday
 
 Sunny, with a high near 82.
Friday Night
 
 Clear, with a low around 60.
Saturday
 
 Sunny, with a high near 86.
Saturday Night
 
 Mostly clear, with a low around 62.
Sunday
 
 Mostly sunny, with a high near 86.

 

Forecast from NOAA-NWS for Fullerton CA.