National Weather Service Forecast for: Fountain Valley CA
Issued by: National Weather Service San Diego, CA
Updated: 12:35 pm PST Dec 22, 2025
 
Tonight

Tonight: Cloudy, with a low around 55. Southwest wind around 5 mph becoming calm.
Cloudy

 Tuesday

Tuesday: Showers likely, mainly after 4pm. Cloudy, with a high near 66. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Slight Chance
Showers then
Showers
Likely
 Tuesday
Night
Tuesday Night: Showers. The rain could be heavy at times. Low around 59. East wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Heavy Rain

 Wednesday

Wednesday: Showers, with thunderstorms also possible after 10am. Some of the storms could produce heavy rainfall. High near 65. South wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Heavy Rain

 Wednesday
Night
Wednesday Night: Showers and possibly a thunderstorm. Low around 57. South wind 5 to 10 mph becoming east after midnight. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Showers

 Christmas
Day
Christmas Day: Showers. High near 65. Chance of precipitation is 80%.
Showers

 Thursday
Night
Thursday Night: Showers. Low around 53. Chance of precipitation is 90%.
Showers

 Friday

Friday: Showers. Mostly cloudy, with a high near 62.
Showers

 Friday
Night
Friday Night: A chance of showers. Mostly cloudy, with a low around 47.
Chance
Showers
Lo 55 °F Hi 66 °F Lo 59 °F Hi 65 °F Lo 57 °F Hi 65 °F Lo 53 °F Hi 62 °F Lo 47 °F

Flood Watch
Wind Advisory
 

Tonight
 
 Cloudy, with a low around 55. Southwest wind around 5 mph becoming calm.
Tuesday
 
 Showers likely, mainly after 4pm. Cloudy, with a high near 66. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
 
 Showers. The rain could be heavy at times. Low around 59. East wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Wednesday
 
 Showers, with thunderstorms also possible after 10am. Some of the storms could produce heavy rainfall. High near 65. South wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Wednesday Night
 
 Showers and possibly a thunderstorm. Low around 57. South wind 5 to 10 mph becoming east after midnight. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Christmas Day
 
 Showers. High near 65. Chance of precipitation is 80%.
Thursday Night
 
 Showers. Low around 53. Chance of precipitation is 90%.
Friday
 
 Showers. Mostly cloudy, with a high near 62.
Friday Night
 
 A chance of showers. Mostly cloudy, with a low around 47.
Saturday
 
 A slight chance of showers. Mostly sunny, with a high near 61.
Saturday Night
 
 Partly cloudy, with a low around 46.
Sunday
 
 Sunny, with a high near 65.
Sunday Night
 
 Mostly clear, with a low around 47.
Monday
 
 A slight chance of showers. Mostly sunny, with a high near 65.

 

Forecast from NOAA-NWS for Fountain Valley CA.