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.

Partly Cloudy

83°F

28°C

Humidity 39%
Wind Speed WSW 9 MPH
Barometer 29.93 in (1013.55 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 23 Aug 09:53 PM PDT
Extended Forecast for

3 Miles SSE Rancho Cucamonga CA

Extreme Heat Watch August 25, 10:00am until August 28, 08:00pm
Heat Advisory August 23, 10:08pm until August 25, 10:00am
Click here for hazard details and duration
Extreme Heat Watch
Heat Advisory
  •  
    Heat Advisory August 23, 10:08pm until August 25, 10:00am

    NOW until 10:00am Tue

    Heat Advisory

  • Tonight

    Low: 73 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 101. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 101 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 73. Southwest wind 5 to 10 mph becoming light and variable in the evening.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 104. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 104 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 74. Southwest wind 5 to 10 mph becoming light and variable in the evening.

    Low: 74 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 103.

    High: 103 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 104.

    High: 104 °F

    Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 73. South wind around 5 mph becoming calm.
Monday
Sunny, with a high near 101. Light and variable wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Monday Night
Mostly clear, with a low around 73. Southwest wind 5 to 10 mph becoming light and variable in the evening.
Tuesday
Sunny, with a high near 104. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Tuesday Night
Clear, with a low around 74. Southwest wind 5 to 10 mph becoming light and variable in the evening.
Wednesday
Sunny, with a high near 103.
Wednesday Night
Mostly clear, with a low around 76.
Thursday
Sunny, with a high near 104.
Thursday Night
Mostly clear, with a low around 76.
Friday
Sunny, with a high near 103.
Friday Night
Mostly clear, with a low around 74.
Saturday
Sunny, with a high near 102.
Saturday Night
Mostly clear, with a low around 72.
Sunday
Sunny, with a high near 100.
Basemap Options
Click map to change the forecast location
Loading map...
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:
5:32 pm PDT Aug 23, 2026
Forecast Valid:
10pm PDT Aug 23, 2026-6pm PDT Aug 30, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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