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

70°F

21°C

Humidity 77%
Wind Speed WNW 3 MPH
Barometer 29.97 in (1014.9 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 31 Jul 03:00 AM PDT
Extended Forecast for

3 Miles SSE Rancho Cucamonga CA

Extreme Heat Warning July 31, 03:19am until August 2, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning July 31, 03:19am until August 2, 08:00pm

    NOW until 8:00pm Sun

    Extreme Heat Warning

  • Overnight

    Low: 67 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 102. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 102 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 72. West wind 5 to 10 mph becoming light and variable in the evening.

    Low: 72 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 103. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 103 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 72. Southwest wind 5 to 10 mph becoming light in the evening. Winds could gust as high as 20 mph.

    Low: 72 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 101.

    High: 101 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 71.

    Low: 71 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 98.

    High: 98 °F

    Sunny

Detailed Forecast

Overnight
Clear, with a low around 67. Calm wind.
Friday
Sunny, with a high near 102. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Mostly clear, with a low around 72. West wind 5 to 10 mph becoming light and variable in the evening.
Saturday
Sunny, with a high near 103. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Saturday Night
Clear, with a low around 72. Southwest wind 5 to 10 mph becoming light in the evening. Winds could gust as high as 20 mph.
Sunday
Sunny, with a high near 101.
Sunday Night
Clear, with a low around 71.
Monday
Sunny, with a high near 98.
Monday Night
Clear, with a low around 69.
Tuesday
Sunny, with a high near 99.
Tuesday Night
Clear, with a low around 69.
Wednesday
Sunny, with a high near 98.
Wednesday Night
Mostly clear, with a low around 70.
Thursday
Sunny, with a high near 97.
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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:
12:45 am PDT Jul 31, 2026
Forecast Valid:
3am PDT Jul 31, 2026-6pm PDT Aug 6, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation