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

86°F

30°C

Humidity 28%
Wind Speed N 3 MPH
Barometer 29.87 in (1011.51 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 06 Oct 09:53 PM PDT
Extended Forecast for

Rancho Cucamonga CA

Extreme Heat Warning October 6, 10:07pm until October 8, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning October 6, 10:07pm until October 8, 08:00pm

    NOW until 8:00pm Thu

    Extreme Heat Warning

  • Tonight

    Low: 73 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 100. Light and variable wind becoming west 5 to 10 mph in the afternoon.

    High: 100 °F

    Sunny

  • Wednesday Night

    Wednesday 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

  • Thursday

    Thursday: Sunny, with a high near 98. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 98 °F

    Sunny

  • Thursday Night

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

    Low: 72 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Saturday

    Saturday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 85.

    High: 85 °F

    Patchy Fog
    then Mostly
    Sunny

Detailed Forecast

Tonight
Clear, with a low around 73. Calm wind.
Wednesday
Sunny, with a high near 100. Light and variable wind becoming west 5 to 10 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 72. West wind 5 to 10 mph becoming light and variable in the evening.
Thursday
Sunny, with a high near 98. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
Mostly clear, with a low around 72. West wind 5 to 10 mph becoming light southwest in the evening.
Friday
Sunny, with a high near 95.
Friday Night
Mostly clear, with a low around 67.
Saturday
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 85.
Saturday Night
Partly cloudy, with a low around 61.
Sunday
A chance of showers, mainly after 11am. Partly sunny, with a high near 77.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 55.
Columbus Day
A chance of showers. Partly sunny, with a high near 71.
Monday Night
A chance of showers. Mostly cloudy, with a low around 53.
Tuesday
A slight chance of showers. Mostly sunny, with a high near 74.
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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:
8:57 pm PDT Oct 6, 2026
Forecast Valid:
10pm PDT Oct 6, 2026-6pm PDT Oct 13, 2026
 
Forecast Discussion
 
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Additional Resources

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