National Weather Service Forecast for: Fontana CA
Issued by: National Weather Service San Diego, CA
Updated: 1:04 am PST Feb 2, 2026
 
Overnight

Overnight: Mostly clear, with a low around 54. Calm wind.
Mostly Clear
 Monday

Monday: Sunny, with a high near 78. Calm wind becoming west around 5 mph in the afternoon.
Sunny
 Monday
Night
Monday Night: Mostly clear, with a low around 55. West wind around 5 mph becoming calm.
Mostly Clear
 Tuesday

Tuesday: Sunny, with a high near 82. North wind around 15 mph, with gusts as high as 25 mph.
Sunny
 Tuesday
Night
Tuesday Night: Clear, with a low around 56. North wind around 15 mph, with gusts as high as 25 mph.
Clear
 Wednesday

Wednesday: Sunny, with a high near 83.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 57.
Mostly Clear
 Thursday

Thursday: Mostly sunny, with a high near 81.
Mostly Sunny
 Thursday
Night
Thursday Night: Mostly cloudy, with a low around 56.
Mostly Cloudy
Lo 54 °F Hi 78 °F Lo 55 °F Hi 82 °F Lo 56 °F Hi 83 °F Lo 57 °F Hi 81 °F Lo 56 °F

Air Quality Alert
 

Overnight
 
 Mostly clear, with a low around 54. Calm wind.
Monday
 
 Sunny, with a high near 78. Calm wind becoming west around 5 mph in the afternoon.
Monday Night
 
 Mostly clear, with a low around 55. West wind around 5 mph becoming calm.
Tuesday
 
 Sunny, with a high near 82. North wind around 15 mph, with gusts as high as 25 mph.
Tuesday Night
 
 Clear, with a low around 56. North wind around 15 mph, with gusts as high as 25 mph.
Wednesday
 
 Sunny, with a high near 83.
Wednesday Night
 
 Mostly clear, with a low around 57.
Thursday
 
 Mostly sunny, with a high near 81.
Thursday Night
 
 Mostly cloudy, with a low around 56.
Friday
 
 Partly sunny, with a high near 75.
Friday Night
 
 Partly cloudy, with a low around 54.
Saturday
 
 Sunny, with a high near 77.
Saturday Night
 
 Mostly clear, with a low around 54.
Sunday
 
 Sunny, with a high near 79.

 

Forecast from NOAA-NWS for Fontana CA.