National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Fontana-Arrow Highway (CQ057)

Lat: 34.10056°NLon: 117.49222°WElev: 1191.0ft.

NA

99°F

37°C

Humidity 27%
Wind Speed WSW 7 MPH
Barometer NA
Dewpoint 60°F (16°C)
Visibility NA
Heat Index99°F (37°C)
Last update 22 Aug 06:00 PM PDT
Extended Forecast for

5 Miles S Fontana CA

Extreme Heat Watch August 25, 10:00am until August 28, 08:00pm
Heat Advisory August 22, 07:45pm until August 25, 10:00am
Click here for hazard details and duration
Extreme Heat Watch
Heat Advisory
  •  
    Heat Advisory August 22, 07:45pm until August 25, 10:00am

    NOW until 10:00am Tue

    Heat Advisory

  • Tonight

    Low: 71 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 101. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 101 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 72. West wind 10 to 15 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.

    Low: 72 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 99. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 99 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 73. West wind 5 to 10 mph becoming light and variable in the evening.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 101.

    High: 101 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 104.

    High: 104 °F

    Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 71. West wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.
Sunday
Sunny, with a high near 101. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
Mostly clear, with a low around 72. West wind 10 to 15 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.
Monday
Sunny, with a high near 99. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Monday Night
Mostly clear, with a low around 73. West wind 5 to 10 mph becoming light and variable in the evening.
Tuesday
Sunny, with a high near 101.
Tuesday Night
Mostly clear, with a low around 75.
Wednesday
Sunny, with a high near 104.
Wednesday Night
Mostly clear, with a low around 75.
Thursday
Sunny, with a high near 104.
Thursday Night
Partly cloudy, with a low around 75.
Friday
Sunny, with a high near 104.
Friday Night
Mostly clear, with a low around 73.
Saturday
Sunny, with a high near 102.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles S Fontana CA
 34.03°N 117.44°W (Elev. 1532 ft)
Last Update:
1:41 pm PDT Aug 22, 2026
Forecast Valid:
7pm PDT Aug 22, 2026-6pm PDT Aug 29, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation