Major River Flooding in Western Washington; Very Cold Temperatures in the Northern Plains

Major river flooding following heavy rainfall will continue to bring a significant risk to life and property in Washington. Arctic air will bring near record cold temperatures and dangerous wind chills from the Northern High Plains into the Mid-South and Mid-Atlantic through the weekend. A narrow band of snow is likely from the Mid-West, Upper Ohio Valley into the Central Appalachians. Read More >

Current conditions at

Ontario Municipal Airport (KONO)

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

Clear

43°F

6°C

Humidity 73%
Wind Speed WNW 3 MPH
Barometer 30.18 in (1022.01 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Last update 12 Dec 05:53 PM MST
Extended Forecast for

Ontario ORSimilar City Names

Air Stagnation Advisory December 12, 06:26pm until December 15, 05:00am
Click here for hazard details and duration
Air Stagnation Advisory
  •  
    Air Stagnation Advisory December 12, 06:26pm until December 15, 05:00am

    NOW until 5:00am Mon

    Air Stagnation Advisory

  • Tonight

    Low: 30 °F

    Patchy Fog

  • Saturday

    Saturday: Patchy fog before 11am.  Otherwise, mostly sunny, with a high near 50. Calm wind.

    High: 50 °F

    Patchy Fog
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 11pm.  Otherwise, mostly clear, with a low around 27. Calm wind.

    Low: 27 °F

    Patchy Fog

  • Sunday

    Sunday: Patchy fog before 11am.  Otherwise, mostly sunny, with a high near 48. Calm wind.

    High: 48 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 29. Calm wind.

    Low: 29 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of rain after 11am.  Mostly cloudy, with a high near 45.

    High: 45 °F

    Slight Chance
    Rain

  • Monday Night

    Monday Night: A 50 percent chance of rain.  Mostly cloudy, with a low around 34.

    Low: 34 °F

    Chance Rain

  • Tuesday

    Tuesday: A 40 percent chance of rain.  Mostly cloudy, with a high near 52.

    High: 52 °F

    Chance Rain

Detailed Forecast

Tonight
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 30. Calm wind.
Saturday
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 50. Calm wind.
Saturday Night
Patchy fog after 11pm. Otherwise, mostly clear, with a low around 27. Calm wind.
Sunday
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 48. Calm wind.
Sunday Night
Partly cloudy, with a low around 29. Calm wind.
Monday
A 20 percent chance of rain after 11am. Mostly cloudy, with a high near 45.
Monday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 34.
Tuesday
A 40 percent chance of rain. Mostly cloudy, with a high near 52.
Tuesday Night
Rain. Low around 39. Chance of precipitation is 90%.
Wednesday
A 50 percent chance of rain, mainly before 11am. Partly sunny, with a high near 52.
Wednesday Night
A chance of rain and snow. Mostly cloudy, with a low around 33. Chance of precipitation is 40%.
Thursday
Rain and snow. High near 48. Chance of precipitation is 80%.
Thursday Night
Rain likely. Mostly cloudy, with a low around 36. Chance of precipitation is 70%.
Friday
Rain likely. Mostly cloudy, with a high near 50. Chance of precipitation is 70%.
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ABOUT THIS FORECAST

 
Point Forecast:
Ontario ORSimilar City Names
 44.03°N 116.97°W (Elev. 2103 ft)
2:03 pm MST Dec 12, 2025
6pm MST Dec 12, 2025-6pm MST Dec 19, 2025
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

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