Severe Thunderstorms and Heavy Rain in the Mid-Atlantic; Heat Persists Across the South

Scattered severe thunderstorms and excessive rainfall are possible into the night in the Mid Atlantic, and heavy rain will shift to Virginia and the Carolinas on Friday. Severe thunderstorms are also possible in the Central Plains into the Upper MS Valley and the Deep South tonight. Dangerous heat persists across the Southern Plains and Lower MS Valley and heat will expand into the Southwest. Read More >

Current conditions at

Ontario Municipal Airport (KONO)

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

Clear

61°F

16°C

Humidity 59%
Wind Speed W 3 MPH
Barometer 29.98 in (1015.24 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 21 Aug 06:35 AM MDT
Extended Forecast for

Ontario Municipal OR

Heat Advisory August 21, 06:51am until August 21, 09:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 21, 06:51am until August 21, 09:00pm

    NOW until 9:00pm Fri

    Heat Advisory

  • Today

    High: 99 °F

    Patchy Smoke
    then Partly
    Sunny

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before midnight.  Partly cloudy during the early evening, then becoming cloudy, with a low around 68. Light and variable wind becoming west southwest 5 to 8 mph.

    Low: 68 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms.  Partly sunny and hot, with a high near 97. Light and variable wind becoming south 8 to 13 mph in the morning. Winds could gust as high as 22 mph.

    High: 97 °F

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before midnight.  Partly cloudy, with a low around 64. South southwest wind 13 to 18 mph becoming north northwest in the evening. Winds could gust as high as 31 mph.

    Low: 64 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: Sunny and hot, with a high near 92. West northwest wind 5 to 8 mph.

    High: 92 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny and hot, with a high near 93.

    High: 93 °F

    Hot

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

Detailed Forecast

Today
Patchy smoke before noon. Partly sunny and hot, with a high near 99. Light and variable wind.
Tonight
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy during the early evening, then becoming cloudy, with a low around 68. Light and variable wind becoming west southwest 5 to 8 mph.
Saturday
A 20 percent chance of showers and thunderstorms. Partly sunny and hot, with a high near 97. Light and variable wind becoming south 8 to 13 mph in the morning. Winds could gust as high as 22 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 64. South southwest wind 13 to 18 mph becoming north northwest in the evening. Winds could gust as high as 31 mph.
Sunday
Sunny and hot, with a high near 92. West northwest wind 5 to 8 mph.
Sunday Night
Mostly clear, with a low around 62.
Monday
Mostly sunny and hot, with a high near 93.
Monday Night
Partly cloudy, with a low around 63.
Tuesday
Sunny and hot, with a high near 95.
Tuesday Night
Partly cloudy, with a low around 64.
Wednesday
Mostly sunny and hot, with a high near 94.
Wednesday Night
Partly cloudy, with a low around 61.
Thursday
Mostly sunny and hot, with a high near 91.
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ABOUT THIS FORECAST

 
Point Forecast:
Ontario Municipal OR
 44.03°N 117°W (Elev. 2139 ft)
12:29 am MDT Aug 21, 2026
6am MDT Aug 21, 2026-6pm MDT Aug 27, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

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