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.

Partly Cloudy

87°F

31°C

Humidity 33%
Wind Speed WSW 11 MPH
Barometer 29.88 in (1011.85 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 11 Aug 05:53 PM PDT
Extended Forecast for

Rancho Cucamonga CA

Heat Advisory August 11, 06:04pm until August 11, 08:00pm
Click here for hazard details and duration
...
  •  
    Heat Advisory August 11, 06:04pm until August 11, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • Tonight

    Low: 66 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95. Light south wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 95 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 66. West wind 5 to 10 mph.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 94. Light southwest wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 94 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 67. West wind 5 to 10 mph becoming light southwest after midnight. Winds could gust as high as 20 mph.

    Low: 67 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 91.

    High: 91 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 63.

    Low: 63 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 66. West wind 5 to 10 mph becoming light southwest after midnight. Winds could gust as high as 20 mph.
Tuesday
Sunny, with a high near 95. Light south wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 66. West wind 5 to 10 mph.
Wednesday
Sunny, with a high near 94. Light southwest wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 67. West wind 5 to 10 mph becoming light southwest after midnight. Winds could gust as high as 20 mph.
Thursday
Sunny, with a high near 91.
Thursday Night
Clear, with a low around 63.
Friday
Sunny, with a high near 88.
Friday Night
Clear, with a low around 61.
Saturday
Sunny, with a high near 87.
Saturday Night
Clear, with a low around 61.
Sunday
Sunny, with a high near 88.
Sunday Night
Clear, with a low around 63.
Monday
Sunny, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Rancho Cucamonga CA
 34.1°N 117.57°W (Elev. 1198 ft)
Last Update:
1:21 pm PDT Aug 11, 2025
Forecast Valid:
6pm PDT Aug 11, 2025-6pm PDT Aug 18, 2025
 
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