Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

Ontario Municipal Airport (KONO)

Lat: 44.01424°NLon: 117.00808°WElev: 2185.0ft.

Clear

99°F

37°C

Humidity 13%
Wind Speed N 0 MPH
Barometer 29.91 in (1012.87 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Heat Index94°F (34°C)
Last update 19 Aug 05:00 PM MDT
Extended Forecast for

Ontario Municipal OR

Heat Advisory August 20, 12:00pm until August 21, 09:00pm
Click here for hazard details and duration
Heat Advisory
  • Tonight

    Tonight: Mostly clear, with a low around 60. Light and variable wind.

    Low: 60 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 99. West southwest wind around 5 mph becoming calm  in the morning.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 63. Light and variable wind.

    Low: 63 °F

    Mostly Cloudy

  • Friday

    Friday: Patchy smoke between 7am and 11am. Partly sunny and hot, with a high near 99. Light and variable wind.

    High: 99 °F

    Patchy Smoke
    then Partly
    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 67. Calm wind.

    Low: 67 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny and hot, with a high near 96.

    High: 96 °F

    Hot

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny and hot, with a high near 90.

    High: 90 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 60. Light and variable wind.
Thursday
Sunny and hot, with a high near 99. West southwest wind around 5 mph becoming calm in the morning.
Thursday Night
Mostly cloudy, with a low around 63. Light and variable wind.
Friday
Patchy smoke between 7am and 11am. Partly sunny and hot, with a high near 99. Light and variable wind.
Friday Night
Mostly cloudy, with a low around 67. Calm wind.
Saturday
Partly sunny and hot, with a high near 96.
Saturday Night
Partly cloudy, with a low around 61.
Sunday
Sunny and hot, with a high near 90.
Sunday Night
Mostly clear, with a low around 58.
Monday
Mostly sunny and hot, with a high near 92.
Monday Night
Partly cloudy, with a low around 61.
Tuesday
Mostly sunny and hot, with a high near 93.
Tuesday Night
Partly cloudy, with a low around 62.
Wednesday
Mostly sunny and hot, with a high near 92.
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ABOUT THIS FORECAST

 
Point Forecast:
Ontario Municipal OR
 44.01°N 117°W (Elev. 2129 ft)
12:32 pm MDT Aug 19, 2026
5pm MDT Aug 19, 2026-6pm MDT Aug 26, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database