National Weather Service Forecast for: Grand Terrace CA
Issued by: National Weather Service San Diego, CA
Updated: 12:48 am PDT Jun 30, 2026
 
Overnight

Overnight: Mostly cloudy, with a low around 58. West wind around 5 mph becoming calm.
Mostly Cloudy
 Tuesday

Tuesday: Cloudy through mid morning, then gradual clearing, with a high near 79. West wind 5 to 10 mph, with gusts as high as 20 mph.
Becoming
Sunny
 Tuesday
Night
Tuesday Night: Increasing clouds, with a low around 57. West wind 5 to 10 mph becoming south after midnight. Winds could gust as high as 20 mph.
Increasing
Clouds
 Wednesday

Wednesday: Cloudy through mid morning, then gradual clearing, with a high near 82. Light west wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Becoming
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 57. West wind 5 to 10 mph becoming light after midnight.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 85.
Sunny
 Thursday
Night
Thursday Night: Mostly clear, with a low around 59.
Mostly Clear
 Friday

Friday: Sunny, with a high near 88.
Sunny
 Friday
Night
Friday Night: Mostly clear, with a low around 61.
Mostly Clear
Lo 58 °F Hi 79 °F Lo 57 °F Hi 82 °F Lo 57 °F Hi 85 °F Lo 59 °F Hi 88 °F Lo 61 °F

 

Overnight
 
 Mostly cloudy, with a low around 58. West wind around 5 mph becoming calm.
Tuesday
 
 Cloudy through mid morning, then gradual clearing, with a high near 79. West wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
 
 Increasing clouds, with a low around 57. West wind 5 to 10 mph becoming south after midnight. Winds could gust as high as 20 mph.
Wednesday
 
 Cloudy through mid morning, then gradual clearing, with a high near 82. Light west wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
 
 Mostly clear, with a low around 57. West wind 5 to 10 mph becoming light after midnight.
Thursday
 
 Sunny, with a high near 85.
Thursday Night
 
 Mostly clear, with a low around 59.
Friday
 
 Sunny, with a high near 88.
Friday Night
 
 Mostly clear, with a low around 61.
Independence Day
 
 Mostly sunny, with a high near 91.
Saturday Night
 
 Mostly clear, with a low around 62.
Sunday
 
 Sunny, with a high near 91.
Sunday Night
 
 Mostly clear, with a low around 62.
Monday
 
 Sunny, with a high near 92.

 

Forecast from NOAA-NWS for Grand Terrace CA.