National Weather Service Forecast for: Montclair CA
Issued by: National Weather Service San Diego, CA
Updated: 12:51 pm PST Dec 23, 2025
 
Tonight

Tonight: Showers, mainly after 10pm. Low around 55. Light southeast wind becoming east 5 to 10 mph in the evening. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Showers

 Wednesday

Wednesday: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 62. Southeast wind 10 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Heavy Rain

 Wednesday
Night
Wednesday Night: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 53. Southwest wind around 5 mph becoming calm after midnight. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Heavy Rain

 Christmas
Day
Christmas Day: Showers likely, with thunderstorms also possible after 4pm. Cloudy, with a high near 61. East wind 5 to 15 mph becoming south in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Showers
Likely

 Thursday
Night
Thursday Night: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 52. Southwest wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Heavy Rain

 Friday

Friday: Showers, mainly before 10am. High near 59. Chance of precipitation is 90%.
Showers then
Chance
Showers
 Friday
Night
Friday Night: A chance of showers, mainly before 10pm. Mostly cloudy, with a low around 45. Chance of precipitation is 50%.
Chance
Showers then
Slight Chance
Showers
 Saturday

Saturday: Sunny, with a high near 59.
Sunny

 Saturday
Night
Saturday Night: Clear, with a low around 43.
Clear
Lo 55 °F Hi 62 °F Lo 53 °F Hi 61 °F Lo 52 °F Hi 59 °F Lo 45 °F Hi 59 °F Lo 43 °F

Flood Watch
Wind Advisory
 

Tonight
 
 Showers, mainly after 10pm. Low around 55. Light southeast wind becoming east 5 to 10 mph in the evening. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
 
 Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 62. Southeast wind 10 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Wednesday Night
 
 Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 53. Southwest wind around 5 mph becoming calm after midnight. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Christmas Day
 
 Showers likely, with thunderstorms also possible after 4pm. Cloudy, with a high near 61. East wind 5 to 15 mph becoming south in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
 
 Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 52. Southwest wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Friday
 
 Showers, mainly before 10am. High near 59. Chance of precipitation is 90%.
Friday Night
 
 A chance of showers, mainly before 10pm. Mostly cloudy, with a low around 45. Chance of precipitation is 50%.
Saturday
 
 Sunny, with a high near 59.
Saturday Night
 
 Clear, with a low around 43.
Sunday
 
 Sunny, with a high near 63.
Sunday Night
 
 Clear, with a low around 46.
Monday
 
 Sunny, with a high near 66.
Monday Night
 
 A slight chance of showers. Partly cloudy, with a low around 49.
Tuesday
 
 A slight chance of showers. Mostly sunny, with a high near 69.

 

Forecast from NOAA-NWS for Montclair CA.