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

Heat Persists in the South Central U.S. and California; Heavy Rain in the Ohio Valley

Sweltering heat remains across the South-Central Plains and Lower/Middle Mississippi Valley, as well as in the Southwest and California this week with limited nighttime relief. Heavy rainfall will lead to localized areas of flash flooding in parts of the Ohio Valley/Central Appalachians. Dry and breezy conditions will enhance fire weather concerns across the northern Rockies and High Plains. Read More >

Current conditions at

Ontario Municipal Airport (KONO)

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

Clear

57°F

14°C

Humidity 67%
Wind Speed N 0 MPH
Barometer 30.17 in (1021.67 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 09 Sep 10:35 PM MDT
Extended Forecast for

Ontario OR

  • Tonight

    Tonight: Clear, with a low around 49. Light and variable wind.

    Low: 49 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 87. Light and variable wind.

    High: 87 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 53. Northwest wind 5 to 8 mph, with gusts as high as 20 mph.

    Low: 53 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 80. Northwest wind 5 to 8 mph becoming calm in the afternoon.

    High: 80 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 50. Light and variable wind.

    Low: 50 °F

    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of showers after noon. Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 48. Chance of precipitation is 60%.

    Low: 48 °F

    Showers
    Likely

  • Sunday

    Sunday: A 40 percent chance of showers. Partly sunny, with a high near 65.

    High: 65 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 44.

    Low: 44 °F

    Patchy Fog

Detailed Forecast

Tonight
Clear, with a low around 49. Light and variable wind.
Thursday
Sunny, with a high near 87. Light and variable wind.
Thursday Night
Mostly clear, with a low around 53. Northwest wind 5 to 8 mph, with gusts as high as 20 mph.
Friday
Sunny, with a high near 80. Northwest wind 5 to 8 mph becoming calm in the afternoon.
Friday Night
Mostly clear, with a low around 50. Light and variable wind.
Saturday
A 30 percent chance of showers after noon. Mostly sunny, with a high near 76.
Saturday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 48. Chance of precipitation is 60%.
Sunday
A 40 percent chance of showers. Partly sunny, with a high near 65.
Sunday Night
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 44.
Monday
Areas of fog before 10am. Otherwise, sunny, with a high near 67.
Monday Night
Patchy fog. Otherwise, mostly clear, with a low around 44.
Tuesday
Patchy fog. Otherwise, sunny, with a high near 71.
Tuesday Night
Partly cloudy, with a low around 48.
Wednesday
Mostly sunny, with a high near 73.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Ontario OR
 44.03°N 116.97°W (Elev. 2103 ft)
Last Update:
12:29 pm MDT Sep 9, 2026
Forecast Valid:
10pm MDT Sep 9, 2026-6pm MDT Sep 16, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation