Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, 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

79°F

26°C

Humidity 22%
Wind Speed NNW 12 MPH
Barometer 29.98 in (1015.24 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 19 Aug 12:55 AM MDT
Extended Forecast for

Ontario OR

  • Overnight

    Overnight: Mostly clear, with a low around 64. North northwest wind around 5 mph becoming calm.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 96. West wind around 5 mph becoming calm  in the morning.

    High: 96 °F

    Hot

  • Wednesday Night

    Wednesday Night: Patchy smoke after 4am. Mostly clear, with a low around 63. North northeast wind around 6 mph becoming calm  after midnight.

    Low: 63 °F

    Mostly Clear
    then Patchy
    Smoke

  • Thursday

    Thursday: Patchy smoke before 11am. Sunny and hot, with a high near 100. Calm wind becoming west southwest around 6 mph in the afternoon.

    High: 100 °F

    Patchy Smoke
    then Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 65. West northwest wind 5 to 7 mph becoming light and variable  after midnight.

    Low: 65 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny and hot, with a high near 100.

    High: 100 °F

    Hot

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 69.

    Low: 69 °F

    Mostly Cloudy

  • Saturday

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

    High: 96 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 64. North northwest wind around 5 mph becoming calm.
Wednesday
Sunny and hot, with a high near 96. West wind around 5 mph becoming calm in the morning.
Wednesday Night
Patchy smoke after 4am. Mostly clear, with a low around 63. North northeast wind around 6 mph becoming calm after midnight.
Thursday
Patchy smoke before 11am. Sunny and hot, with a high near 100. Calm wind becoming west southwest around 6 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 65. West northwest wind 5 to 7 mph becoming light and variable after midnight.
Friday
Partly sunny and hot, with a high near 100.
Friday Night
Mostly cloudy, with a low around 69.
Saturday
Mostly sunny and hot, with a high near 96.
Saturday Night
Mostly clear, with a low around 64.
Sunday
Sunny and hot, with a high near 91.
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 65.
Tuesday
Mostly sunny and hot, with a high near 94.
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ABOUT THIS FORECAST

 
Point Forecast:
Ontario OR
 44.03°N 116.97°W (Elev. 2103 ft)
12:29 am MDT Aug 19, 2026
1am MDT Aug 19, 2026-6pm MDT Aug 25, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database