National Weather Service Forecast for: Grand Terrace CA
Issued by: National Weather Service San Diego, CA
Updated: 8:40 pm PST Dec 22, 2025
 
Tonight

Tonight: Mostly cloudy, with a low around 52. Calm wind.
Mostly Cloudy
 Tuesday

Tuesday: A chance of showers, mainly after 4pm. Mostly cloudy, with a high near 67. South wind 5 to 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Chance
Showers
 Tuesday
Night
Tuesday Night: Showers, mainly after 10pm. The rain could be heavy at times. Low around 54. Southeast wind 5 to 10 mph increasing to 10 to 15 mph after midnight. Winds could gust 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 63. Breezy, with a southeast wind 15 to 20 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 40 mph. Chance of precipitation is 100%. New rainfall amounts between 2 and 3 inches possible.
Heavy Rain
and Breezy
 Wednesday
Night
Wednesday Night: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 53. Southwest wind 5 to 10 mph becoming east after midnight. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Heavy Rain
 Christmas
Day
Christmas Day: Showers. High near 63. Chance of precipitation is 80%.
Showers
 Thursday
Night
Thursday Night: Showers. Low around 50. Chance of precipitation is 90%.
Showers
 Friday

Friday: Showers. Mostly cloudy, with a high near 60.
Showers
 Friday
Night
Friday Night: A chance of showers. Mostly cloudy, with a low around 44.
Chance
Showers
Lo 52 °F Hi 67 °F Lo 54 °F Hi 63 °F Lo 53 °F Hi 63 °F Lo 50 °F Hi 60 °F Lo 44 °F

Flood Watch
Wind Advisory
 

Tonight
 
 Mostly cloudy, with a low around 52. Calm wind.
Tuesday
 
 A chance of showers, mainly after 4pm. Mostly cloudy, with a high near 67. South wind 5 to 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
 
 Showers, mainly after 10pm. The rain could be heavy at times. Low around 54. Southeast wind 5 to 10 mph increasing to 10 to 15 mph after midnight. Winds could gust 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 63. Breezy, with a southeast wind 15 to 20 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 40 mph. Chance of precipitation is 100%. New rainfall amounts between 2 and 3 inches possible.
Wednesday Night
 
 Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 53. Southwest wind 5 to 10 mph becoming east after midnight. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Christmas Day
 
 Showers. High near 63. Chance of precipitation is 80%.
Thursday Night
 
 Showers. Low around 50. Chance of precipitation is 90%.
Friday
 
 Showers. Mostly cloudy, with a high near 60.
Friday Night
 
 A chance of showers. Mostly cloudy, with a low around 44.
Saturday
 
 A slight chance of showers. Mostly sunny, with a high near 60.
Saturday Night
 
 A slight chance of showers. Partly cloudy, with a low around 42.
Sunday
 
 Sunny, with a high near 63.
Sunday Night
 
 Partly cloudy, with a low around 44.
Monday
 
 A slight chance of showers. Mostly sunny, with a high near 67.

 

Forecast from NOAA-NWS for Grand Terrace CA.