National Weather Service Forecast for: Fountain Valley 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. Calm wind becoming southwest around 5 mph in the afternoon.
Sunny
 Monday
Night
Monday Night: Partly cloudy, with a low around 56. Calm wind.
Partly Cloudy
 Tuesday

Tuesday: Sunny, with a high near 74. Light and variable wind becoming west 5 to 10 mph in the afternoon.
Sunny
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 55. Northwest wind around 5 mph becoming east in the evening.
Mostly Clear
 Wednesday

Wednesday: Sunny, with a high near 74.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 57.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 77.
Sunny
 Thursday
Night
Thursday Night: Mostly clear, with a low around 58.
Mostly Clear
Lo 54 °F Hi 76 °F Lo 56 °F Hi 74 °F Lo 55 °F Hi 74 °F Lo 57 °F Hi 77 °F Lo 58 °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. Calm wind becoming southwest around 5 mph in the afternoon.
Monday Night
 
 Partly cloudy, with a low around 56. Calm wind.
Tuesday
 
 Sunny, with a high near 74. Light and variable wind becoming west 5 to 10 mph in the afternoon.
Tuesday Night
 
 Mostly clear, with a low around 55. Northwest wind around 5 mph becoming east in the evening.
Wednesday
 
 Sunny, with a high near 74.
Wednesday Night
 
 Mostly clear, with a low around 57.
Thursday
 
 Sunny, with a high near 77.
Thursday Night
 
 Mostly clear, with a low around 58.
Friday
 
 Sunny, with a high near 81.
Friday Night
 
 Mostly clear, with a low around 61.
Saturday
 
 Sunny, with a high near 85.
Saturday Night
 
 Mostly clear, with a low around 63.
Sunday
 
 Mostly sunny, with a high near 85.

 

Forecast from NOAA-NWS for Fountain Valley CA.