National Weather Service Forecast for: San Dimas CA
Issued by: National Weather Service Los Angeles/Oxnard, CA
Updated: 4:31 pm PST Feb 1, 2026
 
Overnight

Overnight: Mostly clear, with a low around 55. Calm wind.
Mostly Clear
 Monday

Monday: Mostly sunny, with a high near 76. Calm wind becoming west southwest around 5 mph in the afternoon.
Mostly Sunny
 Monday
Night
Monday Night: Mostly clear, with a low around 54. Calm wind.
Mostly Clear
 Tuesday

Tuesday: Sunny, with a high near 83. North northeast wind around 5 mph becoming calm.
Sunny
 Tuesday
Night
Tuesday Night: Clear, with a low around 56. North northeast wind 5 to 10 mph.
Clear
 Wednesday

Wednesday: Sunny, with a high near 87.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 58.
Mostly Clear
 Thursday

Thursday: Mostly sunny, with a high near 85.
Mostly Sunny
 Thursday
Night
Thursday Night: Partly cloudy, with a low around 55.
Partly Cloudy
Lo 55 °F Hi 76 °F Lo 54 °F Hi 83 °F Lo 56 °F Hi 87 °F Lo 58 °F Hi 85 °F Lo 55 °F

Air Quality Alert
 

Overnight
 
 Mostly clear, with a low around 55. Calm wind.
Monday
 
 Mostly sunny, with a high near 76. Calm wind becoming west southwest around 5 mph in the afternoon.
Monday Night
 
 Mostly clear, with a low around 54. Calm wind.
Tuesday
 
 Sunny, with a high near 83. North northeast wind around 5 mph becoming calm.
Tuesday Night
 
 Clear, with a low around 56. North northeast wind 5 to 10 mph.
Wednesday
 
 Sunny, with a high near 87.
Wednesday Night
 
 Mostly clear, with a low around 58.
Thursday
 
 Mostly sunny, with a high near 85.
Thursday Night
 
 Partly cloudy, with a low around 55.
Friday
 
 Mostly sunny, with a high near 74.
Friday Night
 
 Mostly clear, with a low around 53.
Saturday
 
 Mostly sunny, with a high near 74.
Saturday Night
 
 Mostly clear, with a low around 54.
Sunday
 
 Sunny, with a high near 79.

 

Forecast from NOAA-NWS for San Dimas CA.