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Weather Forecast for Fontana

Now
Current Weather Conditions
84° F

Wind: 3.44 mph
Humidity: 46%
Clouds: 0%
Pressure: 1015 hPa
Sunrise: 9:13 AM ET
Sunset: 10:33 PM ET
Tomorrow
Tomorrow's Weather Conditions
Mostly Clear

Sunny
Wed
Wed's Weather Conditions
Clear

Sunny


Extended Forecast
 
National Weather Service Forecast for: Fontana CA
Issued by: National Weather Service San Diego, CA
Updated: 2:04 am PDT Aug 18, 2025
 
Today

Today: Sunny, with a high near 93. West wind 5 to 15 mph, with gusts as high as 20 mph.
High: 93 °F
Tonight

Tonight: Mostly clear, with a low around 64. West wind 10 to 15 mph becoming light  in the evening. Winds could gust as high as 20 mph.
Low: 64 °F
Tuesday

Tuesday: Sunny, with a high near 93. Light southwest wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
High: 93 °F
Tuesday
Night
Tuesday Night: Clear, with a low around 66. West wind 5 to 10 mph becoming light and variable  in the evening. Winds could gust as high as 20 mph.
Low: 66 °F
Wednesday

Wednesday: Sunny, with a high near 97. Light west wind increasing to 5 to 10 mph in the afternoon.
High: 97 °F
Wednesday
Night
Wednesday Night: Clear, with a low around 69.
Low: 69 °F
Thursday

Thursday: Sunny, with a high near 100.
High: 100 °F
Thursday
Night
Thursday Night: Mostly clear, with a low around 74.
Low: 74 °F
Friday

Friday: Sunny, with a high near 100.
High: 100 °F
Sunny
Mostly Clear
Sunny
Clear
Sunny
Clear
Sunny
Mostly Clear
Sunny

Extreme Heat Watch


Today
 
Sunny, with a high near 93. West wind 5 to 15 mph, with gusts as high as 20 mph.
Tonight
 
Mostly clear, with a low around 64. West wind 10 to 15 mph becoming light in the evening. Winds could gust as high as 20 mph.
Tuesday
 
Sunny, with a high near 93. Light southwest wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Tuesday Night
 
Clear, with a low around 66. West wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.
Wednesday
 
Sunny, with a high near 97. Light west wind increasing to 5 to 10 mph in the afternoon.
Wednesday Night
 
Clear, with a low around 69.
Thursday
 
Sunny, with a high near 100.
Thursday Night
 
Mostly clear, with a low around 74.
Friday
 
Sunny, with a high near 100.
Friday Night
 
Mostly clear, with a low around 73.
Saturday
 
Mostly sunny, with a high near 98.
Saturday Night
 
Mostly clear, with a low around 72.
Sunday
 
Sunny, with a high near 97.

Forecast from NOAA-NWS for Fontana.



 


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