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

72°F

22°C

Humidity 76%
Wind Speed N 0 MPH
Barometer 29.92 in (1013.21 mb)
Dewpoint 64°F (18°C)
Visibility 8.00 mi
Last update 25 Jul 06:53 AM PDT
Extended Forecast for

Rancho Cucamonga CA

Extreme Heat Warning July 25, 07:06am until July 27, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning July 25, 07:06am until July 27, 08:00pm

    NOW until 8:00pm Mon

    Extreme Heat Warning

  • Today

    High: 99 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 70. West wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.

    Low: 70 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 98. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 98 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 70. West wind 5 to 10 mph becoming light southwest in the evening. Winds could gust as high as 20 mph.

    Low: 70 °F

    Mostly Clear

  • Monday

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

    High: 98 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 98.

    High: 98 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 99. 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 70. West wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.
Sunday
Mostly sunny, with a high near 98. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
Mostly clear, with a low around 70. West wind 5 to 10 mph becoming light southwest in the evening. Winds could gust as high as 20 mph.
Monday
Sunny, with a high near 98. Light southwest wind increasing to 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Monday Night
Mostly clear, with a low around 68.
Tuesday
Sunny, with a high near 98.
Tuesday Night
Mostly clear, with a low around 68.
Wednesday
Sunny, with a high near 97.
Wednesday Night
Mostly clear, with a low around 68.
Thursday
Sunny, with a high near 99.
Thursday Night
Mostly clear, with a low around 68.
Friday
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:
Rancho Cucamonga CA
 34.12°N 117.6°W (Elev. 1368 ft)
Last Update:
12:16 am PDT Jul 25, 2026
Forecast Valid:
7am PDT Jul 25, 2026-6pm PDT Jul 31, 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