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Fontana, California 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Fontana CA
National Weather Service Forecast for: Fontana CA
Issued by: National Weather Service San Diego, CA
Updated: 12:56 pm PST Dec 18, 2025
 
This
Afternoon
This Afternoon: Sunny, with a high near 81. West wind around 5 mph.
Sunny
 Tonight

Tonight: Mostly clear, with a low around 56. Calm wind becoming northeast around 5 mph.
Mostly Clear
 Friday

Friday: Sunny, with a high near 77. Calm wind becoming southwest around 5 mph in the afternoon.
Sunny
 Friday
Night
Friday Night: Mostly clear, with a low around 54. Calm wind becoming northeast around 5 mph.
Mostly Clear
 Saturday

Saturday: Mostly sunny, with a high near 75. Calm wind becoming southwest around 5 mph in the afternoon.
Mostly Sunny
 Saturday
Night
Saturday Night: Partly cloudy, with a low around 54.
Partly Cloudy
 Sunday

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

Monday: Partly sunny, then gradually becoming sunny, with a high near 75.
Becoming
Sunny
Hi 81 °F Lo 56 °F Hi 77 °F Lo 54 °F Hi 75 °F Lo 54 °F Hi 75 °F Lo 53 °F Hi 75 °F

Air Quality Alert
 

This Afternoon
 
 Sunny, with a high near 81. West wind around 5 mph.
Tonight
 
 Mostly clear, with a low around 56. Calm wind becoming northeast around 5 mph.
Friday
 
 Sunny, with a high near 77. Calm wind becoming southwest around 5 mph in the afternoon.
Friday Night
 
 Mostly clear, with a low around 54. Calm wind becoming northeast around 5 mph.
Saturday
 
 Mostly sunny, with a high near 75. Calm wind becoming southwest around 5 mph in the afternoon.
Saturday Night
 
 Partly cloudy, with a low around 54.
Sunday
 
 Partly sunny, with a high near 75.
Sunday Night
 
 Mostly cloudy, with a low around 53.
Monday
 
 Partly sunny, then gradually becoming sunny, with a high near 75.
Monday Night
 
 Clear, with a low around 51.
Tuesday
 
 A chance of showers. Increasing clouds, with a high near 69.
Tuesday Night
 
 Showers likely. Mostly cloudy, with a low around 53.
Wednesday
 
 Showers. The rain could be heavy at times. Cloudy, with a high near 63.

 

Forecast from NOAA-NWS for Fontana CA.

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