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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

Ontario Municipal Airport (KONO)

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

Clear

75°F

24°C

Humidity 36%
Wind Speed WSW 3 MPH
Barometer 29.99 in (1015.58 mb)
Dewpoint 46°F (8°C)
Visibility 8.00 mi
Last update 28 Aug 11:35 AM MDT
Extended Forecast for

Ontario ORSimilar City Names

  • Today

    Today: Partly sunny, with a high near 89. Calm wind becoming southeast 5 to 7 mph in the afternoon.

    High: 89 °F

    Partly Sunny

  • Tonight

    Tonight: Isolated showers and thunderstorms before midnight. Patchy smoke between 8pm and 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 62. South southeast wind 5 to 8 mph. Chance of precipitation is 20%.

    Low: 62 °F

    Isolated
    T-storms then
    Patchy Smoke

  • Saturday

    Saturday: Sunny, with a high near 86. South southwest wind 3 to 6 mph.

    High: 86 °F

    Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 54. West wind 7 to 14 mph, with gusts as high as 26 mph.

    Low: 54 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 79. West wind 5 to 7 mph becoming calm in the afternoon.

    High: 79 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 48.

    Low: 48 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Monday Night

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

    Low: 58 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 89. Calm wind becoming southeast 5 to 7 mph in the afternoon.
Tonight
Isolated showers and thunderstorms before midnight. Patchy smoke between 8pm and 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 62. South southeast wind 5 to 8 mph. Chance of precipitation is 20%.
Saturday
Sunny, with a high near 86. South southwest wind 3 to 6 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 54. West wind 7 to 14 mph, with gusts as high as 26 mph.
Sunday
Sunny, with a high near 79. West wind 5 to 7 mph becoming calm in the afternoon.
Sunday Night
Mostly clear, with a low around 48.
Monday
Sunny, with a high near 88.
Monday Night
Mostly clear, with a low around 58.
Tuesday
Mostly sunny, with a high near 87.
Tuesday Night
Partly cloudy, with a low around 55.
Wednesday
Mostly sunny, with a high near 80.
Wednesday Night
Mostly cloudy, with a low around 54.
Thursday
A 20 percent chance of showers. Mostly sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
Ontario ORSimilar City Names
 44.03°N 116.97°W (Elev. 2103 ft)
Last Update:
12:29 am MDT Aug 28, 2026
Forecast Valid:
11am MDT Aug 28, 2026-6pm MDT Sep 3, 2026
 
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