National Weather Service United States Department of Commerce

Heavy rain and mountain snow across the northwestern U.S. this weekend

A Pacific storm system will continue to impact the Pacific Northwest through late Sunday. Heavy rainfall could lead to flash flooding, river and small stream flooding, as well as mudslides and debris flows, especially over burn scars. At higher elevations, strong winds and heavy snowfall, with accumulations of 1 to 3 feet, could result in hazardous travel through mountain passes.
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Current Conditions

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Lewistown MT

7 Day Forecast

For More Weather Information:

Great Falls, MT Local Forecast Office

Today

Chance Rain Chance for Measurable Precipitation 50%

Chance
Rain

High: 46 °FFalling Temperatures

Tonight

Chance Rain/Snow Chance for Measurable Precipitation 40%

Chance
Rain/Snow

Low: 29 °F

Monday

Chance Rain/Snow Chance for Measurable Precipitation 30%

Chance
Rain/Snow

High: 33 °F

Monday
Night

Chance Snow Chance for Measurable Precipitation 30%

Chance
Snow

Low: 19 °F

Tuesday

Mostly Sunny

Mostly
Sunny

High: 35 °F

Tuesday
Night

Chance Rain/Snow Chance for Measurable Precipitation 30%

Chance
Rain/Snow

Low: 26 °F

Wednesday

Rain/Snow Likely Chance for Measurable Precipitation 60%

Rain/Snow
Likely

High: 38 °F

Wednesday
Night

Snow

Snow

Low: 21 °F

Christmas
Day

Snow Likely

Snow
Likely

High: 26 °F

Detailed Forecast

  • Today A 50 percent chance of rain. Mostly cloudy, with a temperature falling to around 38 by 5pm. Breezy, with a west wind 22 to 29 mph, with gusts as high as 48 mph.
  • Tonight A chance of rain before 11pm, then a slight chance of snow. Mostly cloudy, with a low around 29. Blustery, with a west northwest wind 24 to 26 mph, with gusts as high as 44 mph. Chance of precipitation is 40%. New snow accumulation of less than a half inch possible.
  • Monday A chance of snow before 11am, then a chance of rain and snow. Partly sunny, with a steady temperature around 33. Breezy, with a west northwest wind 21 to 23 mph, with gusts as high as 32 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.
  • Monday Night A 30 percent chance of snow, mainly before 11pm. Mostly cloudy, with a low around 19. West northwest wind around 16 mph, with gusts as high as 23 mph. New snow accumulation of less than a half inch possible.
  • Tuesday Mostly sunny, with a high near 35. West southwest wind 8 to 10 mph.
  • Tuesday Night A chance of snow before 11pm, then a chance of rain and snow. Mostly cloudy, with a low around 26. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.
  • Wednesday Rain and snow likely, becoming all rain after 11am. Mostly cloudy, with a high near 38. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
  • Wednesday Night Snow. Cloudy, with a low around 21.
  • Christmas Day Snow likely. Cloudy, with a high near 26.
  • Thursday Night A slight chance of snow. Mostly cloudy, with a low around 13.
  • Friday A slight chance of snow. Partly sunny, with a high near 27.
  • Friday Night Mostly cloudy, with a low around 13.
  • Saturday Partly sunny, with a high near 25.