National Weather Service Forecast for: Spring Valley CA
Issued by: National Weather Service San Diego, CA
Updated: 12:34 am PDT Aug 20, 2026
 
Overnight

Overnight: Partly cloudy, with a low around 67. Southwest wind around 5 mph becoming calm.
Partly Cloudy

 Thursday

Thursday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 87. Light southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Patchy Fog
then Mostly
Sunny
 Thursday
Night
Thursday Night: Patchy fog after 5am. Otherwise, mostly clear, with a low around 67. Southwest wind around 5 mph becoming calm in the evening.
Mostly Clear
then Patchy
Fog
 Friday

Friday: Patchy fog before 8am. Otherwise, sunny, with a high near 87. Light west wind increasing to 5 to 10 mph in the morning.
Patchy Fog
then Sunny
 Friday
Night
Friday Night: Mostly clear, with a low around 67. Southwest wind around 5 mph becoming calm in the evening.
Mostly Clear

 Saturday

Saturday: Sunny, with a high near 88.
Sunny

 Saturday
Night
Saturday Night: Mostly clear, with a low around 68.
Mostly Clear

 Sunday

Sunday: Patchy fog before 11am. Otherwise, sunny, with a high near 89.
Patchy Fog
then Sunny
 Sunday
Night
Sunday Night: Mostly clear, with a low around 68.
Mostly Clear
Lo 67 °F Hi 87 °F Lo 67 °F Hi 87 °F Lo 67 °F Hi 88 °F Lo 68 °F Hi 89 °F Lo 68 °F

 

Overnight
 
 Partly cloudy, with a low around 67. Southwest wind around 5 mph becoming calm.
Thursday
 
 Patchy fog before 11am. Otherwise, mostly sunny, with a high near 87. Light southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Thursday Night
 
 Patchy fog after 5am. Otherwise, mostly clear, with a low around 67. Southwest wind around 5 mph becoming calm in the evening.
Friday
 
 Patchy fog before 8am. Otherwise, sunny, with a high near 87. Light west wind increasing to 5 to 10 mph in the morning.
Friday Night
 
 Mostly clear, with a low around 67. Southwest wind around 5 mph becoming calm in the evening.
Saturday
 
 Sunny, with a high near 88.
Saturday Night
 
 Mostly clear, with a low around 68.
Sunday
 
 Patchy fog before 11am. Otherwise, sunny, with a high near 89.
Sunday Night
 
 Mostly clear, with a low around 68.
Monday
 
 Sunny, with a high near 89.
Monday Night
 
 Mostly clear, with a low around 69.
Tuesday
 
 Sunny, with a high near 90.
Tuesday Night
 
 Mostly clear, with a low around 70.
Wednesday
 
 Sunny, with a high near 91.

 

Forecast from NOAA-NWS for Spring Valley CA.