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

Tonight: Patchy fog after 4am. Otherwise, cloudy, with a low around 52. Calm wind.
Mostly Cloudy
then Patchy
Fog

 Tuesday

Tuesday: Showers likely, mainly after 4pm. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 65. Calm wind becoming east around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Slight Chance
Showers and
Patchy Fog
then Showers
Likely
 Tuesday
Night
Tuesday Night: Showers. The rain could be heavy at times. Low around 55. Southeast wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between 1 and 2 inches possible.
Heavy Rain


 Wednesday

Wednesday: Showers. The rain could be heavy at times. High near 61. Southeast wind 5 to 15 mph becoming south in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between 2 and 3 inches possible.
Heavy Rain


 Wednesday
Night
Wednesday Night: Showers. Low around 53. Light and variable wind becoming northeast 5 to 10 mph after midnight. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Showers


 Christmas
Day
Christmas Day: Showers. High near 61. Chance of precipitation is 80%.
Showers


 Thursday
Night
Thursday Night: Showers. Low around 51. Chance of precipitation is 90%.
Showers


 Friday

Friday: Showers. Mostly cloudy, with a high near 58.
Showers


 Friday
Night
Friday Night: Showers likely, mainly before 10pm. Mostly cloudy, with a low around 44.
Showers
Likely
Lo 52 °F Hi 65 °F Lo 55 °F Hi 61 °F Lo 53 °F Hi 61 °F Lo 51 °F Hi 58 °F Lo 44 °F

Flood Watch
Wind Advisory
 

Tonight
 
 Patchy fog after 4am. Otherwise, cloudy, with a low around 52. Calm wind.
Tuesday
 
 Showers likely, mainly after 4pm. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 65. Calm wind becoming east around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
 
 Showers. The rain could be heavy at times. Low around 55. Southeast wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between 1 and 2 inches possible.
Wednesday
 
 Showers. The rain could be heavy at times. High near 61. Southeast wind 5 to 15 mph becoming south in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between 2 and 3 inches possible.
Wednesday Night
 
 Showers. Low around 53. Light and variable wind becoming northeast 5 to 10 mph after midnight. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Christmas Day
 
 Showers. High near 61. Chance of precipitation is 80%.
Thursday Night
 
 Showers. Low around 51. Chance of precipitation is 90%.
Friday
 
 Showers. Mostly cloudy, with a high near 58.
Friday Night
 
 Showers likely, mainly before 10pm. Mostly cloudy, with a low around 44.
Saturday
 
 A slight chance of showers. Partly sunny, with a high near 60.
Saturday Night
 
 A slight chance of showers. Partly cloudy, with a low around 43.
Sunday
 
 Sunny, with a high near 62.
Sunday Night
 
 Partly cloudy, with a low around 45.
Monday
 
 A slight chance of showers. Mostly sunny, with a high near 65.

 

Forecast from NOAA-NWS for Montclair CA.