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Weather Forecast for Fontana

Now
Current Weather Conditions
56° F

Wind: 1.95 mph
Humidity: 87%
Clouds: 0%
Pressure: 1012 hPa
Sunrise: 9:49 AM ET
Sunset: 9:24 PM ET
Tomorrow
Tomorrow's Weather Conditions
Mostly Clear

Slight Chance
T-storms
Fri
Fri's Weather Conditions
Chance
Showers

Slight Chance
T-storms


Extended Forecast
 
National Weather Service Forecast for: Fontana CA
Issued by: National Weather Service San Diego, CA
Updated: 2:09 am PDT Oct 8, 2025
 
Today

Today: Patchy fog before 8am.  Otherwise, sunny, with a high near 84. Light southwest wind increasing to 5 to 10 mph in the afternoon.
High: 84 °F
Tonight

Tonight: Mostly clear, with a low around 59. Southwest wind around 5 mph becoming calm  in the evening.
Low: 59 °F
Thursday

Thursday: A slight chance of showers and thunderstorms after 11am.  Mostly sunny, with a high near 84. Calm wind becoming northwest around 5 mph.  Chance of precipitation is 20%.
High: 84 °F
Thursday
Night
Thursday Night: A chance of showers and thunderstorms.  Mostly cloudy, with a low around 66. Southwest wind around 5 mph becoming calm.  Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Low: 66 °F
Friday

Friday: A slight chance of showers, with thunderstorms also possible after 11am.  Mostly sunny, with a high near 85. Calm wind becoming east around 5 mph in the afternoon.  Chance of precipitation is 20%.
High: 85 °F
Friday
Night
Friday Night: Partly cloudy, with a low around 61.
Low: 61 °F
Saturday

Saturday: Sunny, with a high near 78.
High: 78 °F
Saturday
Night
Saturday Night: Mostly clear, with a low around 54.
Low: 54 °F
Sunday

Sunday: Sunny, with a high near 78.
High: 78 °F
Patchy Fog
then Sunny
Mostly Clear
Slight Chance
T-storms
Chance
Showers
Slight Chance
T-storms
Partly Cloudy
Sunny
Mostly Clear
Sunny


Today
 
Patchy fog before 8am. Otherwise, sunny, with a high near 84. Light southwest wind increasing to 5 to 10 mph in the afternoon.
Tonight
 
Mostly clear, with a low around 59. Southwest wind around 5 mph becoming calm in the evening.
Thursday
 
A slight chance of showers and thunderstorms after 11am. Mostly sunny, with a high near 84. Calm wind becoming northwest around 5 mph. Chance of precipitation is 20%.
Thursday Night
 
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Southwest wind around 5 mph becoming calm. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
 
A slight chance of showers, with thunderstorms also possible after 11am. Mostly sunny, with a high near 85. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 20%.
Friday Night
 
Partly cloudy, with a low around 61.
Saturday
 
Sunny, with a high near 78.
Saturday Night
 
Mostly clear, with a low around 54.
Sunday
 
Sunny, with a high near 78.
Sunday Night
 
Mostly clear, with a low around 52.
Columbus Day
 
Sunny, with a high near 74.
Monday Night
 
Partly cloudy, with a low around 52.
Tuesday
 
A slight chance of showers. Mostly sunny, with a high near 68.

Forecast from NOAA-NWS for Fontana.



 


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