National Weather Service Forecast for: Fountain Valley CA
Issued by: National Weather Service San Diego, CA
Updated: 2:23 am PDT Jun 30, 2026
 
Overnight

Overnight: Patchy drizzle. Mostly cloudy, with a low around 62. South wind around 5 mph becoming calm.
Patchy
Drizzle
 Tuesday

Tuesday: Cloudy through mid morning, then gradual clearing, with a high near 72. Light and variable wind becoming southwest 5 to 10 mph in the morning.
Gradual
Clearing
 Tuesday
Night
Tuesday Night: Increasing clouds, with a low around 61. Southwest wind 5 to 10 mph becoming light west after midnight.
Increasing
Clouds
 Wednesday

Wednesday: Cloudy through mid morning, then gradual clearing, with a high near 72. Light south wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Gradual
Clearing
 Wednesday
Night
Wednesday Night: Increasing clouds, with a low around 59. Southwest wind 5 to 10 mph becoming light south after midnight.
Increasing
Clouds
 Thursday

Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 73.
Decreasing
Clouds
 Thursday
Night
Thursday Night: Increasing clouds, with a low around 61.
Increasing
Clouds
 Friday

Friday: Mostly cloudy, then gradually becoming sunny, with a high near 75.
Decreasing
Clouds
 Friday
Night
Friday Night: Partly cloudy, with a low around 62.
Partly Cloudy
Lo 62 °F Hi 72 °F Lo 61 °F Hi 72 °F Lo 59 °F Hi 73 °F Lo 61 °F Hi 75 °F Lo 62 °F

 

Overnight
 
 Patchy drizzle. Mostly cloudy, with a low around 62. South wind around 5 mph becoming calm.
Tuesday
 
 Cloudy through mid morning, then gradual clearing, with a high near 72. Light and variable wind becoming southwest 5 to 10 mph in the morning.
Tuesday Night
 
 Increasing clouds, with a low around 61. Southwest wind 5 to 10 mph becoming light west after midnight.
Wednesday
 
 Cloudy through mid morning, then gradual clearing, with a high near 72. Light south wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
 
 Increasing clouds, with a low around 59. Southwest wind 5 to 10 mph becoming light south after midnight.
Thursday
 
 Mostly cloudy, then gradually becoming sunny, with a high near 73.
Thursday Night
 
 Increasing clouds, with a low around 61.
Friday
 
 Mostly cloudy, then gradually becoming sunny, with a high near 75.
Friday Night
 
 Partly cloudy, with a low around 62.
Independence Day
 
 Mostly sunny, with a high near 75.
Saturday Night
 
 Increasing clouds, with a low around 63.
Sunday
 
 Mostly cloudy, then gradually becoming sunny, with a high near 75.
Sunday Night
 
 Increasing clouds, with a low around 63.
Monday
 
 Mostly cloudy, then gradually becoming sunny, with a high near 75.

 

Forecast from NOAA-NWS for Fountain Valley CA.