National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Ontario International Airport (KONT)

Lat: 34.05316°NLon: 117.57685°WElev: 906.0ft.

Clear

79°F

26°C

Humidity 65%
Wind Speed WSW 4 MPH
Barometer 29.87 in (1011.51 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 29 Aug 11:20 PM PDT
Extended Forecast for

3 Miles SSE Rancho Cucamonga CA

  • Tonight

    Tonight: Mostly clear, with a low around 70. Southwest wind around 5 mph becoming calm.

    Low: 70 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 96. Light and variable wind becoming southwest 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 96 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 66. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 66 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 92. Light south wind becoming southwest 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 92 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 65. Southwest wind 5 to 10 mph becoming north after midnight. Winds could gust as high as 20 mph.

    Low: 65 °F

    Clear

  • Tuesday

    Tuesday: A slight chance of showers after 11am. Mostly sunny, with a high near 89. Chance of precipitation is 20%.

    High: 89 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: A slight chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 20%.

    Low: 66 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 70. Southwest wind around 5 mph becoming calm.
Sunday
Sunny, with a high near 96. Light and variable wind becoming southwest 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
Clear, with a low around 66. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 92. Light south wind becoming southwest 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Monday Night
Clear, with a low around 65. Southwest wind 5 to 10 mph becoming north after midnight. Winds could gust as high as 20 mph.
Tuesday
A slight chance of showers after 11am. Mostly sunny, with a high near 89. Chance of precipitation is 20%.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 90.
Wednesday Night
Partly cloudy, with a low around 66.
Thursday
Sunny, with a high near 91.
Thursday Night
Mostly clear, with a low around 66.
Friday
Sunny, with a high near 93.
Friday Night
Mostly clear, with a low around 68.
Saturday
Sunny, with a high near 95.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE Rancho Cucamonga CA
 34.09°N 117.53°W (Elev. 1106 ft)
Last Update:
12:02 pm PDT Aug 29, 2026
Forecast Valid:
11pm PDT Aug 29, 2026-6pm PDT Sep 5, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation