National Weather Service Forecast for: Montclair CA
Issued by: National Weather Service San Diego, CA
Updated: 12:18 am PDT Sep 13, 2026
 
Overnight

Overnight: Patchy fog. Otherwise, partly cloudy, with a low around 66. West wind around 5 mph.
Patchy Fog
 Sunday

Sunday: Patchy fog before 11am. Otherwise, sunny, with a high near 87. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Patchy Fog
then Sunny
 Sunday
Night
Sunday Night: Clear, with a low around 65. West wind 5 to 10 mph becoming northwest after midnight.
Clear
 Monday

Monday: Sunny, with a high near 87. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Sunny
 Monday
Night
Monday Night: Mostly clear, with a low around 62. West wind 5 to 10 mph, with gusts as high as 20 mph.
Mostly Clear
 Tuesday

Tuesday: Sunny, with a high near 87.
Sunny
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 61.
Mostly Clear
 Wednesday

Wednesday: Sunny, with a high near 88.
Sunny
 Wednesday
Night
Wednesday Night: Clear, with a low around 61.
Clear
Lo 66 °F Hi 87 °F Lo 65 °F Hi 87 °F Lo 62 °F Hi 87 °F Lo 61 °F Hi 88 °F Lo 61 °F

 

Overnight
 
 Patchy fog. Otherwise, partly cloudy, with a low around 66. West wind around 5 mph.
Sunday
 
 Patchy fog before 11am. Otherwise, sunny, with a high near 87. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
 
 Clear, with a low around 65. West wind 5 to 10 mph becoming northwest after midnight.
Monday
 
 Sunny, with a high near 87. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Monday Night
 
 Mostly clear, with a low around 62. West wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday
 
 Sunny, with a high near 87.
Tuesday Night
 
 Mostly clear, with a low around 61.
Wednesday
 
 Sunny, with a high near 88.
Wednesday Night
 
 Clear, with a low around 61.
Thursday
 
 Sunny, with a high near 88.
Thursday Night
 
 Clear, with a low around 63.
Friday
 
 Sunny, with a high near 93.
Friday Night
 
 Clear, with a low around 67.
Saturday
 
 Sunny, with a high near 95.

 

Forecast from NOAA-NWS for Montclair CA.