Tracking Late December Winter Storm Expected to Impact the Northern Plains through the Northeast U.S.

A winter storm system will rapidly intensify over the Midwest on Sunday and track through the Great Lakes on Monday. Periods of heavy snow are anticipated across the Upper Great Lakes late Sunday and continuing into Monday. At least 1/10 inch of ice accumulation is expected from a wintry mix across much of the interior Northeast U.S. starting Sunday afternoon. Read More >

Current conditions at

Portland, Portland-Troutdale Airport (KTTD)

Lat: 45.55111°NLon: 122.40889°WElev: 36.0ft.

Overcast

45°F

7°C

Humidity 75%
Wind Speed SW 9 MPH
Barometer 30.32 in (1026.75 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill40°F (4°C)
Last update 27 Dec 12:00 PM PST
Extended Forecast for

Happy Valley OR

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 42. West southwest wind around 7 mph.

    High: 42 °F

    Partly Sunny

  • Tonight

    Tonight: Widespread frost, mainly after 5am.  Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 33. Light south southeast wind.

    Low: 33 °F

    Mostly Cloudy
    then Frost

  • Sunday

    Sunday: Areas of frost before noon.  Otherwise, partly sunny, with a high near 42. East wind around 6 mph becoming north northeast in the afternoon.

    High: 42 °F

    Areas Frost
    then Partly
    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 33. Northeast wind around 10 mph.

    Low: 33 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 45. Northeast wind around 10 mph.

    High: 45 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 45.

    High: 45 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Areas of frost between 3am and 4am.  Otherwise, mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy
    then Areas
    Frost

  • Wednesday

    Wednesday: Widespread frost between 7am and 10am.  Otherwise, partly sunny, with a high near 45.

    High: 45 °F

    Frost then
    Partly Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 42. West southwest wind around 7 mph.
Tonight
Widespread frost, mainly after 5am. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 33. Light south southeast wind.
Sunday
Areas of frost before noon. Otherwise, partly sunny, with a high near 42. East wind around 6 mph becoming north northeast in the afternoon.
Sunday Night
Mostly cloudy, with a low around 33. Northeast wind around 10 mph.
Monday
Partly sunny, with a high near 45. Northeast wind around 10 mph.
Monday Night
Mostly cloudy, with a low around 33.
Tuesday
Partly sunny, with a high near 45.
Tuesday Night
Areas of frost between 3am and 4am. Otherwise, mostly cloudy, with a low around 33.
Wednesday
Widespread frost between 7am and 10am. Otherwise, partly sunny, with a high near 45.
Wednesday Night
A slight chance of rain after 10pm. Increasing clouds, with a low around 36.
New Year's Day
A chance of rain. Cloudy, with a high near 45.
Thursday Night
Rain likely. Cloudy, with a low around 38.
Friday
Rain likely. Mostly cloudy, with a high near 45.
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ABOUT THIS FORECAST

 
Point Forecast:
Happy Valley OR
 45.46°N 122.56°W (Elev. 925 ft)
11:41 am PST Dec 27, 2025
12pm PST Dec 27, 2025-6pm PST Jan 2, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database