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

Tonight: Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 51. Southwest wind around 5 mph becoming calm.
Mostly Cloudy
then Patchy
Fog
 Tuesday

Tuesday: A chance of showers, mainly after 4pm. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 68. South wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Chance
Showers and
Patchy Fog
 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 25 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Heavy Rain

 Wednesday

Wednesday: Showers, with thunderstorms also possible after 10am. Some of the storms could produce heavy rainfall. High near 65. Breezy, with a southeast wind 15 to 25 mph, with gusts 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. Low around 53. Southwest wind around 5 mph becoming east after midnight. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Showers

 Christmas
Day
Christmas Day: Showers. High near 64. 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 61.
Showers

 Friday
Night
Friday Night: A chance of showers. Mostly cloudy, with a low around 44.
Chance
Showers
Lo 51 °F Hi 68 °F Lo 54 °F Hi 65 °F Lo 53 °F Hi 64 °F Lo 50 °F Hi 61 °F Lo 44 °F

Flood Watch
Wind Advisory
 

Tonight
 
 Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 51. Southwest wind around 5 mph becoming calm.
Tuesday
 
 A chance of showers, mainly after 4pm. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 68. South wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
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 25 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Wednesday
 
 Showers, with thunderstorms also possible after 10am. Some of the storms could produce heavy rainfall. High near 65. Breezy, with a southeast wind 15 to 25 mph, with gusts 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. Low around 53. Southwest wind around 5 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 64. Chance of precipitation is 80%.
Thursday Night
 
 Showers. Low around 50. Chance of precipitation is 90%.
Friday
 
 Showers. Mostly cloudy, with a high near 61.
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 62.
Saturday Night
 
 A slight chance of showers. Partly cloudy, with a low around 42.
Sunday
 
 Sunny, with a high near 65.
Sunday Night
 
 Partly cloudy, with a low around 44.
Monday
 
 A slight chance of showers. Mostly sunny, with a high near 68.

 

Forecast from NOAA-NWS for Grand Terrace CA.