National Weather Service Forecast for: Fountain Valley CA
Issued by: National Weather Service San Diego, CA
Updated: 10:18 am PDT May 26, 2026
 
Tonight

Tonight: Patchy drizzle after 2am. Increasing clouds, with a low around 57. Southwest wind 5 to 10 mph becoming south after midnight. Winds could gust as high as 20 mph.
Partly Cloudy
then Patchy
Drizzle
 Wednesday

Wednesday: Patchy drizzle before 11am. Cloudy through mid morning, then gradual clearing, with a high near 68. South wind 5 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph.
Patchy
Drizzle then
Mostly Sunny
 Wednesday
Night
Wednesday Night: Patchy drizzle after 2am. Mostly cloudy, with a low around 56. Southwest wind 5 to 10 mph becoming light west after midnight. Winds could gust as high as 20 mph.
Partly Cloudy
then Patchy
Drizzle
 Thursday

Thursday: Patchy drizzle before 11am. Mostly cloudy, then gradually becoming sunny, with a high near 70. Light southwest wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Patchy
Drizzle then
Mostly Sunny
 Thursday
Night
Thursday Night: Partly cloudy, with a low around 56. West wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 20 mph.
Partly Cloudy

 Friday

Friday: Mostly sunny, with a high near 71.
Mostly Sunny

 Friday
Night
Friday Night: Mostly clear, with a low around 58.
Mostly Clear

 Saturday

Saturday: Mostly sunny, with a high near 73.
Mostly Sunny

 Saturday
Night
Saturday Night: Mostly clear, with a low around 58.
Mostly Clear
Lo 57 °F Hi 68 °F Lo 56 °F Hi 70 °F Lo 56 °F Hi 71 °F Lo 58 °F Hi 73 °F Lo 58 °F

 

Tonight
 
 Patchy drizzle after 2am. Increasing clouds, with a low around 57. Southwest wind 5 to 10 mph becoming south after midnight. Winds could gust as high as 20 mph.
Wednesday
 
 Patchy drizzle before 11am. Cloudy through mid morning, then gradual clearing, with a high near 68. South wind 5 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
 
 Patchy drizzle after 2am. Mostly cloudy, with a low around 56. Southwest wind 5 to 10 mph becoming light west after midnight. Winds could gust as high as 20 mph.
Thursday
 
 Patchy drizzle before 11am. Mostly cloudy, then gradually becoming sunny, with a high near 70. Light southwest wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
 
 Partly cloudy, with a low around 56. West wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 20 mph.
Friday
 
 Mostly sunny, with a high near 71.
Friday Night
 
 Mostly clear, with a low around 58.
Saturday
 
 Mostly sunny, with a high near 73.
Saturday Night
 
 Mostly clear, with a low around 58.
Sunday
 
 Mostly sunny, with a high near 75.
Sunday Night
 
 Partly cloudy, with a low around 60.
Monday
 
 Mostly sunny, with a high near 77.
Monday Night
 
 Partly cloudy, with a low around 60.
Tuesday
 
 Mostly sunny, with a high near 77.

 

Forecast from NOAA-NWS for Fountain Valley CA.