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

76°F

24°C

Humidity 39%
Wind Speed N 2 MPH
Barometer NA
Dewpoint 50°F (10°C)
Visibility NA
Heat Index78°F (26°C)
Last update 04 Oct 02:00 AM PDT
Extended Forecast for

Fontana CA

Extreme Heat Warning October 4, 04:58am until October 8, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning October 4, 04:58am until October 8, 08:00pm

    NOW until 8:00pm Thu

    Extreme Heat Warning

  • Today

    High: 99 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 74. Southwest wind around 5 mph becoming calm in the evening.

    Low: 74 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 99. North wind around 5 mph becoming calm in the afternoon.

    High: 99 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 73. Southwest wind around 5 mph becoming calm after midnight.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 100. Calm wind becoming west around 5 mph in the afternoon.

    High: 100 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 71.

    Low: 71 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 99.

    High: 99 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 72.

    Low: 72 °F

    Clear

Detailed Forecast

Today
Sunny, with a high near 99. Light and variable wind becoming southeast 5 to 10 mph in the afternoon.
Tonight
Clear, with a low around 74. Southwest wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 99. North wind around 5 mph becoming calm in the afternoon.
Monday Night
Mostly clear, with a low around 73. Southwest wind around 5 mph becoming calm after midnight.
Tuesday
Sunny, with a high near 100. Calm wind becoming west around 5 mph in the afternoon.
Tuesday Night
Clear, with a low around 71.
Wednesday
Sunny, with a high near 99.
Wednesday Night
Clear, with a low around 72.
Thursday
Sunny, with a high near 99.
Thursday Night
Clear, with a low around 72.
Friday
Sunny, with a high near 96.
Friday Night
Mostly clear, with a low around 68.
Saturday
Mostly sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Fontana CA
 34.12°N 117.46°W (Elev. 1381 ft)
Last Update:
12:28 am PDT Oct 4, 2026
Forecast Valid:
4am PDT Oct 4, 2026-6pm PDT Oct 10, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation