National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Severe Thunderstorms; Excessive Rainfall; Dangerous Heat; Air Quality Concerns and the Tropics

Wildfire smoke will push into the Midwest, worsening air quality. A frontal system brings severe storms from the Northern Plains to the Mid‑Atlantic the next few days. Heavy Gulf Coast rain is possible as Tropical Depression Two has formed, while monsoonal storms persist in the Southwest with heavy rainfall. Hazardous heat expands from the Plains into the Lower Mississippi Valley. Read More >

Hazardous Weather Conditions

Current conditions at

Ontario Municipal Airport (KONO)

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

haze

87°F

31°C

Humidity 24%
Wind Speed N 0 MPH
Barometer 30.0 in (1015.92 mb)
Dewpoint 47°F (8°C)
Visibility 5.00 mi
Heat Index84°F (29°C)
Last update 19 Jul 12:53 PM MDT
Extended Forecast for

Ontario ORSimilar City Names

Heat Advisory July 20, 12:00pm until July 20, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • This Afternoon

    This Afternoon: Areas of smoke. Partly sunny and hot, with a high near 101. Light and variable wind becoming east around 5 mph.

    High: 101 °F

    Areas Smoke

  • Tonight

    Tonight: Areas of smoke. Mostly cloudy, with a low around 70. Calm wind becoming north northwest around 6 mph after midnight.

    Low: 70 °F

    Areas Smoke

  • Monday

    Monday: Areas of smoke. Mostly sunny and hot, with a high near 103. North northwest wind 5 to 11 mph.

    High: 103 °F

    Areas Smoke

  • Monday Night

    Monday Night: Widespread smoke, mainly between 7pm and 8pm. Mostly cloudy, with a low around 72. North northwest wind 8 to 13 mph.

    Low: 72 °F

    Smoke

  • Tuesday

    Tuesday: Patchy smoke before 7am. Mostly sunny and hot, with a high near 101. West wind 5 to 7 mph becoming light and variable.

    High: 101 °F

    Patchy Smoke
    then Partly
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny and hot, with a high near 100.

    High: 100 °F

    Hot

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny and hot, with a high near 102.

    High: 102 °F

    Hot

Detailed Forecast

This Afternoon
Areas of smoke. Partly sunny and hot, with a high near 101. Light and variable wind becoming east around 5 mph.
Tonight
Areas of smoke. Mostly cloudy, with a low around 70. Calm wind becoming north northwest around 6 mph after midnight.
Monday
Areas of smoke. Mostly sunny and hot, with a high near 103. North northwest wind 5 to 11 mph.
Monday Night
Widespread smoke, mainly between 7pm and 8pm. Mostly cloudy, with a low around 72. North northwest wind 8 to 13 mph.
Tuesday
Patchy smoke before 7am. Mostly sunny and hot, with a high near 101. West wind 5 to 7 mph becoming light and variable.
Tuesday Night
Partly cloudy, with a low around 73.
Wednesday
Mostly sunny and hot, with a high near 100.
Wednesday Night
Partly cloudy, with a low around 70.
Thursday
Sunny and hot, with a high near 102.
Thursday Night
Mostly clear, with a low around 71.
Friday
Sunny and hot, with a high near 101.
Friday Night
Mostly clear, with a low around 68.
Saturday
Sunny and hot, with a high near 99.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Ontario ORSimilar City Names
 44.03°N 116.97°W (Elev. 2103 ft)
Last Update:
12:29 pm MDT Jul 19, 2026
Forecast Valid:
1pm MDT Jul 19, 2026-6pm MDT Jul 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation