National Weather Service United States Department of Commerce

Arctic Air Will Move Into U.S. This Week

Arctic air will move back into the central Plains, Great Lake States and Western U.S. this week. Winter Storm Warnings, Winter Weather Advisories and Wind Chill Advisories are in effect in many areas. Recent heavy rains across the lower Mississippi and Tennessee Valleys will shift into the Carolinas Monday. Rivers that came up over the weekend will recede across portions of the South.
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Current Conditions

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15 Miles E Mount St Helens WA

7 Day Forecast

For More Weather Information:

Portland, OR Local Forecast Office

Tonight

Snow Chance for Measurable Precipitation 90%

Snow

Low: 34 °F

Monday

Snow Likely Chance for Measurable Precipitation 60%

Snow
Likely

High: 33 °FFalling Temperatures

Monday
Night

Mostly Clear

Mostly
Clear

Low: 6 °F

Tuesday

Sunny

Sunny

High: 24 °F

Tuesday
Night

Clear

Clear

Low: 11 °F

Wednesday

Sunny

Sunny

High: 32 °F

Wednesday
Night

Mostly Clear

Mostly
Clear

Low: 15 °F

New Year's
Day

Mostly Sunny

Mostly
Sunny

High: 30 °F

Thursday
Night

Mostly Cloudy

Mostly
Cloudy

Low: 24 °F

Detailed Forecast

  • Tonight Snow showers. Steady temperature around 34. West northwest wind 3 to 6 mph. Chance of precipitation is 90%. Total nighttime snow accumulation of less than one inch possible.
  • Monday Snow showers likely before 10am. Cloudy through mid morning, then gradual clearing, with a temperature falling to around 20 by 5pm. Southeast wind 5 to 10 mph becoming east northeast in the morning. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
  • Monday Night Mostly clear, with a low around 6. Wind chill values as low as -10. East wind 9 to 11 mph.
  • Tuesday Sunny, with a high near 24. Wind chill values as low as -11. East wind around 14 mph, with gusts as high as 21 mph.
  • Tuesday Night Clear, with a low around 11. East wind around 9 mph.
  • Wednesday Sunny, with a high near 32.
  • Wednesday Night Mostly clear, with a low around 15.
  • New Year's Day Mostly sunny, with a high near 30.
  • Thursday Night Mostly cloudy, with a low around 24.
  • Friday A chance of snow. Mostly cloudy, with a high near 39.
  • Friday Night A chance of rain. Mostly cloudy, with a low around 34.
  • Saturday A chance of rain. Mostly cloudy, with a high near 39.
  • Saturday Night A chance of rain. Mostly cloudy, with a low around 28.
  • Sunday A chance of rain. Mostly cloudy, with a high near 35.