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

85°F

29°C

Humidity 52%
Wind Speed W 1 MPH
Barometer NA
Dewpoint 66°F (19°C)
Visibility NA
Heat Index87°F (31°C)
Last update 27 Aug 11:00 PM PDT
Extended Forecast for

Fontana CA

Extreme Heat Warning August 28, 12:09am until August 28, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 28, 12:09am until August 28, 08:00pm

    NOW until 8:00pm Fri

    Extreme Heat Warning

  • Overnight

    Low: 76 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 104. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 104 °F

    Mostly Sunny

  • Friday Night

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

    Low: 73 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 100. Light and variable wind becoming southwest 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 100 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 70. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 70 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 67.

    Low: 67 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

Detailed Forecast

Overnight
Mostly cloudy, with a low around 76. East wind around 5 mph becoming calm.
Friday
Mostly sunny, with a high near 104. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Mostly clear, with a low around 73. Southwest wind 5 to 10 mph becoming light and variable in the evening.
Saturday
Sunny, with a high near 100. Light and variable wind becoming southwest 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Saturday Night
Clear, with a low around 70. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 96.
Sunday Night
Clear, with a low around 67.
Monday
Sunny, with a high near 92.
Monday Night
Mostly clear, with a low around 64.
Tuesday
A slight chance of showers after 11am. Mostly sunny, with a high near 88.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 66.
Wednesday
Mostly sunny, with a high near 89.
Wednesday Night
Partly cloudy, with a low around 68.
Thursday
Mostly sunny, with a high near 92.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Fontana CA
 34.1°N 117.43°W (Elev. 1296 ft)
Last Update:
9:34 pm PDT Aug 27, 2026
Forecast Valid:
12am PDT Aug 28, 2026-6pm PDT Sep 3, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation