National Weather Service Forecast for: Grand Terrace CA
Issued by: National Weather Service San Diego, CA
Updated: 12:18 am PDT Sep 13, 2026
 
Today

Today: Patchy fog before 11am. Otherwise, sunny, with a high near 90. Light and variable wind becoming west 5 to 10 mph in the afternoon.
Patchy Fog
then Sunny
 Tonight

Tonight: Clear, with a low around 65. Southwest wind 5 to 10 mph becoming light and variable after midnight.
Clear
 Monday

Monday: Sunny, with a high near 90. Light and variable wind becoming west 5 to 10 mph in the afternoon.
Sunny
 Monday
Night
Monday Night: Mostly clear, with a low around 63. Southwest wind around 5 mph becoming south after midnight.
Mostly Clear
 Tuesday

Tuesday: Sunny, with a high near 88. South wind 5 to 10 mph becoming west in the afternoon.
Sunny
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 61.
Mostly Clear
 Wednesday

Wednesday: Sunny, with a high near 89.
Sunny
 Wednesday
Night
Wednesday Night: Clear, with a low around 62.
Clear
 Thursday

Thursday: Sunny, with a high near 90.
Sunny
Hi 90 °F Lo 65 °F Hi 90 °F Lo 63 °F Hi 88 °F Lo 61 °F Hi 89 °F Lo 62 °F Hi 90 °F

 

Today
 
 Patchy fog before 11am. Otherwise, sunny, with a high near 90. Light and variable wind becoming west 5 to 10 mph in the afternoon.
Tonight
 
 Clear, with a low around 65. Southwest wind 5 to 10 mph becoming light and variable after midnight.
Monday
 
 Sunny, with a high near 90. Light and variable wind becoming west 5 to 10 mph in the afternoon.
Monday Night
 
 Mostly clear, with a low around 63. Southwest wind around 5 mph becoming south after midnight.
Tuesday
 
 Sunny, with a high near 88. South wind 5 to 10 mph becoming west in the afternoon.
Tuesday Night
 
 Mostly clear, with a low around 61.
Wednesday
 
 Sunny, with a high near 89.
Wednesday Night
 
 Clear, with a low around 62.
Thursday
 
 Sunny, with a high near 90.
Thursday Night
 
 Clear, with a low around 64.
Friday
 
 Sunny, with a high near 95.
Friday Night
 
 Clear, with a low around 67.
Saturday
 
 Sunny, with a high near 97.

 

Forecast from NOAA-NWS for Grand Terrace CA.