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

Prolonged Atmospheric River in the Northwest; Snow in the North-Central US

A prolonged atmospheric river will bring heavy rainfall which may lead to widespread urban and river flooding, heavy mountain snow, along with gusty winds to the Pacific Northwest into the northern Rockies through much of the week. A clipper will bring a period of snow across the upper Midwest and the Great Lakes into Tuesday, before a stronger system bring more wintry impacts. Read More >

Current conditions at

Ontario Municipal Airport (KONO)

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

Overcast

39°F

4°C

Humidity 93%
Wind Speed WSW 4 MPH
Barometer 30.2 in (1022.69 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 08 Dec 08:05 PM MST
Extended Forecast for

Ontario Municipal OR

  • Tonight

    Tonight: Rain likely. Cloudy, with a low around 43. Calm wind becoming south 5 to 7 mph after midnight. Chance of precipitation is 60%.

    Low: 43 °F

    Rain Likely

  • Tuesday

    Tuesday: Rain likely, mainly after 11am. Cloudy, with a high near 53. South wind 5 to 8 mph becoming north northeast in the afternoon. Chance of precipitation is 70%.

    High: 53 °F

    Rain Likely

  • Tuesday Night

    Tuesday Night: Rain likely, mainly before 11pm. Patchy fog between 8pm and 11pm. Otherwise, mostly cloudy, with a low around 45. Light and variable wind. Chance of precipitation is 60%.

    Low: 45 °F

    Rain Likely
    and Patchy
    Fog

  • Wednesday

    Wednesday: A 30 percent chance of rain, mainly before 11am. Mostly cloudy, with a high near 62. South southwest wind 5 to 8 mph.

    High: 62 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 41. South wind around 7 mph.

    Low: 41 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 59.

    High: 59 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 11am. Otherwise, partly sunny, with a high near 55.

    High: 55 °F

    Patchy Fog
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 33.

    Low: 33 °F

    Patchy Fog

Detailed Forecast

Tonight
Rain likely. Cloudy, with a low around 43. Calm wind becoming south 5 to 7 mph after midnight. Chance of precipitation is 60%.
Tuesday
Rain likely, mainly after 11am. Cloudy, with a high near 53. South wind 5 to 8 mph becoming north northeast in the afternoon. Chance of precipitation is 70%.
Tuesday Night
Rain likely, mainly before 11pm. Patchy fog between 8pm and 11pm. Otherwise, mostly cloudy, with a low around 45. Light and variable wind. Chance of precipitation is 60%.
Wednesday
A 30 percent chance of rain, mainly before 11am. Mostly cloudy, with a high near 62. South southwest wind 5 to 8 mph.
Wednesday Night
Mostly cloudy, with a low around 41. South wind around 7 mph.
Thursday
Partly sunny, with a high near 59.
Thursday Night
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 38.
Friday
Patchy fog before 11am. Otherwise, partly sunny, with a high near 55.
Friday Night
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 33.
Saturday
Areas of fog before 11am. Otherwise, partly sunny, with a high near 51.
Saturday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 32.
Sunday
Patchy fog. Otherwise, partly sunny, with a high near 51.
Sunday Night
Mostly cloudy, with a low around 34.
Monday
A 30 percent chance of rain. Mostly cloudy, with a high near 50.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Ontario Municipal OR
 44.03°N 117°W (Elev. 2139 ft)
Last Update:
2:05 pm MST Dec 8, 2025
Forecast Valid:
8pm MST Dec 8, 2025-6pm MST Dec 15, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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