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

Hazardous Weather Conditions

Current conditions at

Ontario International Airport (KONT)

Lat: 34.05316°NLon: 117.57685°WElev: 906.0ft.

Clear

84°F

29°C

Humidity 26%
Wind Speed WSW 12 MPH
Barometer 29.86 in (1011.18 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 21 May 01:20 PM PDT
Extended Forecast for

Ontario CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 89. West wind around 15 mph, with gusts as high as 25 mph.

    High: 89 °F

    Sunny

  • Tonight

    Tonight: Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 59. West wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 25 mph.

    Low: 59 °F

    Patchy Fog

  • Friday

    Friday: Partly sunny, then gradually becoming sunny, with a high near 83. Light west wind increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 83 °F

    Becoming
    Sunny

  • Friday Night

    Friday Night: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 57. Southwest wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 20 mph.

    Low: 57 °F

    Patchy Fog

  • Saturday

    Saturday: Patchy fog before 11am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 82. Light southwest wind increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 82 °F

    Patchy Fog
    then Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 56.

    Low: 56 °F

    Patchy Fog

  • Sunday

    Sunday: Patchy fog before 11am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 80.

    High: 80 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

  • Memorial Day

    Memorial Day: Sunny, with a high near 77.

    High: 77 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 89. West wind around 15 mph, with gusts as high as 25 mph.
Tonight
Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 59. West wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 25 mph.
Friday
Partly sunny, then gradually becoming sunny, with a high near 83. Light west wind increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Friday Night
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 57. Southwest wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 20 mph.
Saturday
Patchy fog before 11am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 82. Light southwest wind increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Saturday Night
Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 56.
Sunday
Patchy fog before 11am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 80.
Sunday Night
Mostly clear, with a low around 55.
Memorial Day
Sunny, with a high near 77.
Monday Night
Increasing clouds, with a low around 54.
Tuesday
Mostly sunny, with a high near 73.
Tuesday Night
Mostly clear, with a low around 54.
Wednesday
Mostly sunny, with a high near 73.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Ontario CA
 34.03°N 117.61°W (Elev. 823 ft)
Last Update:
12:32 pm PDT May 21, 2026
Forecast Valid:
1pm PDT May 21, 2026-6pm PDT May 27, 2026
 
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