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

Fontana-Arrow Highway (CQ057)

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

NA

63°F

17°C

Humidity 76%
Wind Speed SW 4 MPH
Barometer NA
Dewpoint 56°F (13°C)
Visibility NA
Last update 12 May 09:00 PM PDT
Extended Forecast for

4 Miles E Ontario International Arpt CA

  • Tonight

    Tonight: Increasing clouds, with a low around 57. West wind 5 to 10 mph.

    Low: 57 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 78. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 78 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 56. West wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 56 °F

    Clear

  • Thursday

    Thursday: Patchy fog before 11am. Otherwise, sunny, with a high near 81. Light southwest wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 81 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 57. West wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 20 mph.

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 57. West wind 5 to 10 mph.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 78. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Wednesday Night
Clear, with a low around 56. West wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Patchy fog before 11am. Otherwise, sunny, with a high near 81. Light southwest wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Thursday Night
Mostly clear, with a low around 57. West wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 20 mph.
Friday
Sunny, with a high near 81.
Friday Night
Mostly clear, with a low around 57.
Saturday
Sunny, with a high near 81.
Saturday Night
Mostly clear, with a low around 56.
Sunday
Sunny, with a high near 81.
Sunday Night
Mostly clear, with a low around 57.
Monday
Sunny, with a high near 85.
Monday Night
Mostly clear, with a low around 58.
Tuesday
Sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Ontario International Arpt CA
 34.06°N 117.53°W (Elev. 981 ft)
Last Update:
12:47 pm PDT May 12, 2026
Forecast Valid:
10pm PDT May 12, 2026-6pm PDT May 19, 2026
 
Forecast Discussion
 
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Additional Resources

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