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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St Mary MT

7 Day Forecast

For More Weather Information:

Great Falls, MT Local Forecast Office

This
Afternoon

Chance Snow Chance for Measurable Precipitation 50%

Chance
Snow

High: 34 °F

Tonight

Chance Snow Chance for Measurable Precipitation 30%

Chance
Snow

Low: 29 °F

Monday

Chance Snow Chance for Measurable Precipitation 30%

Chance
Snow

High: 35 °F

Monday
Night

Slight Chance Snow Chance for Measurable Precipitation 20%

Slight Chc
Snow

Low: 23 °F

Tuesday

Slight Chance Snow Chance for Measurable Precipitation 20%

Slight Chc
Snow

High: 33 °F

Tuesday
Night

Chance Snow Chance for Measurable Precipitation 50%

Chance
Snow

Low: 29 °F

Wednesday

Snow Chance for Measurable Precipitation 80%

Snow

High: 35 °F

Wednesday
Night

Snow Likely

Snow
Likely

Low: 23 °F

Christmas
Day

Snow Likely

Snow
Likely

High: 26 °F

Detailed Forecast

  • This Afternoon A 50 percent chance of snow. Mostly cloudy, with a steady temperature around 34. Breezy, with a west wind around 29 mph, with gusts as high as 48 mph. Total daytime snow accumulation of less than a half inch possible.
  • Tonight A 30 percent chance of snow. Mostly cloudy, with a low around 29. Breezy, with a west wind 17 to 24 mph, with gusts as high as 40 mph. New snow accumulation of less than a half inch possible.
  • Monday A 30 percent chance of snow, mainly before 11am. Partly sunny, with a high near 35. West wind 14 to 16 mph, with gusts as high as 23 mph. New snow accumulation of less than a half inch possible.
  • Monday Night A 20 percent chance of snow before 11pm. Mostly cloudy, with a low around 23. West southwest wind around 10 mph.
  • Tuesday A 20 percent chance of snow. Partly sunny, with a high near 33. West southwest wind 13 to 17 mph, with gusts as high as 24 mph.
  • Tuesday Night A 50 percent chance of snow. Mostly cloudy, with a low around 29. New snow accumulation of around an inch possible.
  • Wednesday Snow. High near 35. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.
  • Wednesday Night Snow likely. Cloudy, with a low around 23.
  • Christmas Day Snow likely. Cloudy, with a high near 26.
  • Thursday Night A chance of snow. Mostly cloudy, with a low around 15.
  • Friday A chance of snow. Partly sunny, with a high near 23.
  • Friday Night A chance of snow. Mostly cloudy, with a low around 14.
  • Saturday A chance of snow. Mostly cloudy, with a high near 23.