National Weather Service Forecast for: 3 Miles SW Fontana CA
Issued by: National Weather Service San Diego, CA
Updated: 12:56 pm PST Dec 17, 2025
 
Tonight

Tonight: Mostly clear, with a low around 53. East wind around 5 mph becoming north after midnight.
Mostly Clear
Thursday

Thursday: Sunny, with a high near 84. North wind around 5 mph becoming calm.
Sunny
Thursday
Night
Thursday Night: Mostly clear, with a low around 55. Northeast wind around 5 mph.
Mostly Clear
Friday

Friday: Sunny, with a high near 79. Calm wind becoming southwest around 5 mph in the afternoon.
Sunny
Friday
Night
Friday Night: Mostly clear, with a low around 53. Calm wind becoming northeast around 5 mph.
Mostly Clear
Saturday

Saturday: Sunny, with a high near 75.
Sunny
Saturday
Night
Saturday Night: Partly cloudy, with a low around 53.
Partly Cloudy
Sunday

Sunday: Partly sunny, with a high near 76.
Partly Sunny
Sunday
Night
Sunday Night: Partly cloudy, with a low around 52.
Partly Cloudy
Lo 53 °F Hi 84 °F Lo 55 °F Hi 79 °F Lo 53 °F Hi 75 °F Lo 53 °F Hi 76 °F Lo 52 °F

Air Quality Alert
 

Tonight
 
Mostly clear, with a low around 53. East wind around 5 mph becoming north after midnight.
Thursday
 
Sunny, with a high near 84. North wind around 5 mph becoming calm.
Thursday Night
 
Mostly clear, with a low around 55. Northeast wind around 5 mph.
Friday
 
Sunny, with a high near 79. Calm wind becoming southwest around 5 mph in the afternoon.
Friday Night
 
Mostly clear, with a low around 53. Calm wind becoming northeast around 5 mph.
Saturday
 
Sunny, with a high near 75.
Saturday Night
 
Partly cloudy, with a low around 53.
Sunday
 
Partly sunny, with a high near 76.
Sunday Night
 
Partly cloudy, with a low around 52.
Monday
 
Partly sunny, with a high near 75.
Monday Night
 
Mostly cloudy, with a low around 51.
Tuesday
 
A slight chance of showers. Partly sunny, with a high near 70.
Tuesday Night
 
A chance of showers. Mostly cloudy, with a low around 52.
Wednesday
 
Showers likely. Mostly cloudy, with a high near 66.

 

Forecast from NOAA-NWS for 3 Miles SW Fontana CA.