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Weather Forecast for Fontana

Now
Current Weather Conditions
78° F

Wind: 6.91 mph
Humidity: 49%
Clouds: 0%
Pressure: 1014 hPa
Sunrise: 9:33 AM ET
Sunset: 9:55 PM ET
Tomorrow
Tomorrow's Weather Conditions
Mostly Sunny

Chance
Showers
Fri
Fri's Weather Conditions
Showers
Likely

Chance
Showers


Extended Forecast
 
National Weather Service Forecast for: Fontana CA
Issued by: National Weather Service San Diego, CA
Updated: 1:44 pm PDT Sep 16, 2025
 
Tonight

Tonight: Mostly clear, with a low around 70. Southwest wind around 5 mph becoming calm  after midnight.
Low: 70 °F
Wednesday

Wednesday: Mostly sunny, with a high near 92. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
High: 92 °F
Wednesday
Night
Wednesday Night: A chance of showers and thunderstorms, mainly after 11pm.  Mostly cloudy, with a low around 68. West wind 5 to 10 mph becoming light and variable  after midnight.  Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Low: 68 °F
Thursday

Thursday: Showers likely and possibly a thunderstorm.  Mostly cloudy, with a high near 83. Calm wind becoming west around 5 mph in the afternoon.  Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
High: 83 °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  after midnight.  Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Low: 66 °F
Friday

Friday: A chance of showers and thunderstorms.  Mostly cloudy, then gradually becoming sunny, with a high near 83. Chance of precipitation is 30%.
High: 83 °F
Friday
Night
Friday Night: Partly cloudy, with a low around 65.
Low: 65 °F
Saturday

Saturday: Mostly sunny, with a high near 87.
High: 87 °F
Saturday
Night
Saturday Night: Mostly clear, with a low around 67.
Low: 67 °F
Mostly Clear
Mostly Sunny
Chance
Showers
Showers
Likely
Chance
Showers
Chance
Showers
Partly Cloudy
Mostly Sunny
Mostly Clear


Tonight
 
Mostly clear, with a low around 70. Southwest wind around 5 mph becoming calm after midnight.
Wednesday
 
Mostly sunny, with a high near 92. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
 
A chance of showers and thunderstorms, mainly after 11pm. Mostly cloudy, with a low around 68. West wind 5 to 10 mph becoming light and variable after midnight. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
 
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 83. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
 
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Southwest wind around 5 mph becoming calm after midnight. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
 
A chance of showers and thunderstorms. Mostly cloudy, then gradually becoming sunny, with a high near 83. Chance of precipitation is 30%.
Friday Night
 
Partly cloudy, with a low around 65.
Saturday
 
Mostly sunny, with a high near 87.
Saturday Night
 
Mostly clear, with a low around 67.
Sunday
 
Mostly sunny, with a high near 90.
Sunday Night
 
Mostly clear, with a low around 68.
Monday
 
Sunny, with a high near 90.
Monday Night
 
Mostly clear, with a low around 69.
Tuesday
 
Sunny, with a high near 90.

Forecast from NOAA-NWS for Fontana.



 


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