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

59°F

15°C

Humidity 77%
Wind Speed W 4 MPH
Barometer 29.9 in (1012.53 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 29 Aug 04:10 AM MDT
Extended Forecast for

Ontario OR

  • Today

    Today: Sunny, with a high near 86. Calm wind becoming west southwest 5 to 8 mph in the afternoon.

    High: 86 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 53. Northwest wind 7 to 15 mph, with gusts as high as 29 mph.

    Low: 53 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 79. West wind around 6 mph becoming calm in the morning.

    High: 79 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 47. Calm wind.

    Low: 47 °F

    Decreasing
    Clouds

  • Monday

    Monday: Sunny, with a high near 88. Calm wind.

    High: 88 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers between 11am and 3pm. Partly sunny, with a high near 88. Chance of precipitation is 20%.

    High: 88 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 86. Calm wind becoming west southwest 5 to 8 mph in the afternoon.
Tonight
Partly cloudy, with a low around 53. Northwest wind 7 to 15 mph, with gusts as high as 29 mph.
Sunday
Sunny, with a high near 79. West wind around 6 mph becoming calm in the morning.
Sunday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 47. Calm wind.
Monday
Sunny, with a high near 88. Calm wind.
Monday Night
Partly cloudy, with a low around 56.
Tuesday
A slight chance of showers between 11am and 3pm. Partly sunny, with a high near 88. Chance of precipitation is 20%.
Tuesday Night
Partly cloudy, with a low around 56.
Wednesday
Mostly sunny, with a high near 82.
Wednesday Night
Mostly cloudy, with a low around 56.
Thursday
A 20 percent chance of showers. Partly sunny, with a high near 79.
Thursday Night
Partly cloudy, with a low around 51.
Friday
Mostly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Ontario OR
 44.03°N 116.97°W (Elev. 2103 ft)
Last Update:
12:29 am MDT Aug 29, 2026
Forecast Valid:
4am MDT Aug 29, 2026-6pm MDT Sep 4, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation