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.

Mist

68°F

20°C

Humidity 88%
Wind Speed WSW 4 MPH
Barometer 29.87 in (1011.51 mb)
Dewpoint 64°F (18°C)
Visibility 6.00 mi
Last update 29 Jul 04:05 AM PDT
Extended Forecast for

Rancho Cucamonga CA

Extreme Heat Warning July 30, 10:00am until August 2, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning

  • Today

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

    High: 94 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 66. West wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.

    Low: 66 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 97. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 97 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 68. West wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.

    Low: 68 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 100. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 100 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 102.

    High: 102 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 73.

    Low: 73 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 102.

    High: 102 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 94. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Tonight
Clear, with a low around 66. West wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.
Thursday
Sunny, with a high near 97. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
Clear, with a low around 68. West wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.
Friday
Sunny, with a high near 100. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Mostly clear, with a low around 71.
Saturday
Sunny, with a high near 102.
Saturday Night
Clear, with a low around 73.
Sunday
Sunny, with a high near 102.
Sunday Night
Clear, with a low around 71.
Monday
Sunny, with a high near 99.
Monday Night
Mostly clear, with a low around 70.
Tuesday
Sunny, with a high near 100.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Rancho Cucamonga CA
 34.1°N 117.59°W (Elev. 1224 ft)
Last Update:
12:29 am PDT Jul 29, 2026
Forecast Valid:
4am PDT Jul 29, 2026-6pm PDT Aug 4, 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