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

90°F

32°C

Humidity 27%
Wind Speed WSW 6 MPH
Barometer 29.87 in (1011.51 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 05 Oct 07:40 PM PDT
Extended Forecast for

3 Miles SSE Rancho Cucamonga CA

Extreme Heat Warning October 5, 07:56pm until October 8, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning October 5, 07:56pm until October 8, 08:00pm

    NOW until 8:00pm Thu

    Extreme Heat Warning

  • Tonight

    Low: 73 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 102. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 102 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 73. West wind around 5 mph becoming calm in the evening.

    Low: 73 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 102. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 102 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 71. Southwest wind around 5 mph becoming calm in the evening.

    Low: 71 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 100.

    High: 100 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 70.

    Low: 70 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 98.

    High: 98 °F

    Sunny

Detailed Forecast

Tonight
Clear, with a low around 73. West wind around 5 mph becoming east in the evening.
Tuesday
Sunny, with a high near 102. Calm wind becoming southwest around 5 mph in the afternoon.
Tuesday Night
Clear, with a low around 73. West wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 102. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 71. Southwest wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 100.
Thursday Night
Clear, with a low around 70.
Friday
Sunny, with a high near 98.
Friday Night
Mostly clear, with a low around 69.
Saturday
Sunny, with a high near 91.
Saturday Night
Mostly clear, with a low around 64.
Sunday
A slight chance of showers. Mostly sunny, with a high near 82.
Sunday Night
A slight chance of showers. Partly cloudy, with a low around 59.
Columbus Day
A slight chance of showers. Mostly sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE Rancho Cucamonga CA
 34.09°N 117.53°W (Elev. 1106 ft)
Last Update:
12:17 pm PDT Oct 5, 2026
Forecast Valid:
7pm PDT Oct 5, 2026-6pm PDT Oct 12, 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