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

81°F

27°C

Humidity 54%
Wind Speed W 4 MPH
Barometer 29.87 in (1011.51 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 27 Aug 05:20 AM PDT
Extended Forecast for

2 Miles SW Rancho Cucamonga CA

Extreme Heat Warning August 27, 05:37am until August 28, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 27, 05:37am until August 28, 08:00pm

    NOW until 8:00pm Fri

    Extreme Heat Warning

  • Today

    High: 103 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 76. West wind 5 to 10 mph becoming light and variable in the evening.

    Low: 76 °F

    Partly Cloudy

  • Friday

    Friday: Mostly 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

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 73. Southwest wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.

    Low: 73 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 100. Light southwest wind increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 100 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 71.

    Low: 71 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Today
Mostly sunny, with a high near 103. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Tonight
Partly cloudy, with a low around 76. West wind 5 to 10 mph becoming light and variable in the evening.
Friday
Mostly 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.
Friday Night
Mostly clear, with a low around 73. Southwest wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.
Saturday
Sunny, with a high near 100. Light southwest wind increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Saturday Night
Clear, with a low around 71.
Sunday
Sunny, with a high near 95.
Sunday Night
Mostly clear, with a low around 65.
Monday
Sunny, with a high near 89.
Monday Night
Mostly clear, with a low around 64.
Tuesday
A slight chance of showers. Mostly sunny, with a high near 88.
Tuesday Night
A slight chance of showers. Partly cloudy, with a low around 66.
Wednesday
A slight chance of showers. Partly sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SW Rancho Cucamonga CA
 34.1°N 117.59°W (Elev. 1224 ft)
Last Update:
12:59 am PDT Aug 27, 2026
Forecast Valid:
5am PDT Aug 27, 2026-6pm PDT Sep 2, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation