National Weather Service Forecast for: San Dimas CA
Issued by: National Weather Service Los Angeles/Oxnard, CA
Updated: 1:47 am PDT Jun 30, 2026
 
Overnight

Overnight: Patchy fog. Otherwise, cloudy, with a low around 58. Calm wind.
Patchy Fog
 Tuesday

Tuesday: Cloudy through mid morning, then gradual clearing, with a high near 72. Light south wind becoming southwest 5 to 10 mph in the afternoon.
Gradual
Clearing
 Tuesday
Night
Tuesday Night: Increasing clouds, with a low around 55. Southwest wind 5 to 10 mph becoming light in the evening.
Increasing
Clouds
 Wednesday

Wednesday: Patchy fog before 11am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 77. Light southwest wind increasing to 5 to 10 mph in the afternoon.
Patchy Fog
then Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 56. Southwest wind 5 to 10 mph becoming light south southwest in the evening.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 80.
Sunny
 Thursday
Night
Thursday Night: Mostly clear, with a low around 57.
Mostly Clear
 Friday

Friday: Sunny, with a high near 82.
Sunny
 Friday
Night
Friday Night: Mostly clear, with a low around 59.
Mostly Clear
Lo 58 °F Hi 72 °F Lo 55 °F Hi 77 °F Lo 56 °F Hi 80 °F Lo 57 °F Hi 82 °F Lo 59 °F

 

Overnight
 
 Patchy fog. Otherwise, cloudy, with a low around 58. Calm wind.
Tuesday
 
 Cloudy through mid morning, then gradual clearing, with a high near 72. Light south wind becoming southwest 5 to 10 mph in the afternoon.
Tuesday Night
 
 Increasing clouds, with a low around 55. Southwest wind 5 to 10 mph becoming light in the evening.
Wednesday
 
 Patchy fog before 11am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 77. Light southwest wind increasing to 5 to 10 mph in the afternoon.
Wednesday Night
 
 Mostly clear, with a low around 56. Southwest wind 5 to 10 mph becoming light south southwest in the evening.
Thursday
 
 Sunny, with a high near 80.
Thursday Night
 
 Mostly clear, with a low around 57.
Friday
 
 Sunny, with a high near 82.
Friday Night
 
 Mostly clear, with a low around 59.
Independence Day
 
 Mostly sunny, with a high near 85.
Saturday Night
 
 Mostly clear, with a low around 60.
Sunday
 
 Sunny, with a high near 85.
Sunday Night
 
 Mostly clear, with a low around 60.
Monday
 
 Sunny, with a high near 86.

 

Forecast from NOAA-NWS for San Dimas CA.