National Weather Service United States Department of Commerce

Storm system to bring winter weather from the Plains to New England through Monday

A storm system spinning over the central U.S. will set the stage for a widespread precipitation event across the central and eastern U.S. through Monday. A wide swath of accumulating snow will extend from Nebraska to New England. Just to the south of this area of snow, marginal temps will lead to the possibility of a transition zone of sleet and freezing rain.
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Current Conditions

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St Mary MT

7 Day Forecast

For More Weather Information:

Great Falls, MT Local Forecast Office

Overnight

Partly Cloudy

Partly
Cloudy

Low: 18 °F

Sunday

Chance Snow Chance for Measurable Precipitation 40%

Chance
Snow

High: 33 °F

Sunday
Night

Chance Snow Chance for Measurable Precipitation 50%

Chance
Snow

Low: 25 °F

Monday

Snow Likely Chance for Measurable Precipitation 60%

Snow
Likely

High: 32 °F

Monday
Night

Snow Likely Chance for Measurable Precipitation 70%

Snow
Likely

Low: 21 °F

Tuesday

Chance Snow Chance for Measurable Precipitation 50%

Chance
Snow

High: 22 °F

Tuesday
Night

Slight Chance Snow Chance for Measurable Precipitation 20%

Slight Chc
Snow

Low: 10 °F

Wednesday

Slight Chance Snow

Slight Chc
Snow

High: 30 °F

Wednesday
Night

Slight Chance Snow

Slight Chc
Snow

Low: 28 °F

Detailed Forecast

  • Overnight Partly cloudy, with a steady temperature around 18. South southwest wind around 5 mph.
  • Sunday A 40 percent chance of snow after 11am. Mostly cloudy, with a high near 33. Southwest wind 6 to 11 mph. New snow accumulation of less than a half inch possible.
  • Sunday Night A 50 percent chance of snow. Mostly cloudy, with a low around 25. Southwest wind 8 to 11 mph becoming northwest after midnight. New snow accumulation of less than one inch possible.
  • Monday Snow likely, mainly after 11am. Mostly cloudy, with a high near 32. West southwest wind around 11 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
  • Monday Night Snow likely. Cloudy, with a low around 21. West northwest wind 8 to 10 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.
  • Tuesday A 50 percent chance of snow. Cloudy, with a high near 22. New snow accumulation of 1 to 3 inches possible.
  • Tuesday Night A 20 percent chance of snow. Mostly cloudy, with a low around 10.
  • Wednesday A slight chance of snow. Mostly sunny, with a high near 30.
  • Wednesday Night A slight chance of snow. Mostly cloudy, with a low around 28.
  • Thursday A slight chance of snow. Partly sunny, with a high near 35.
  • Thursday Night A slight chance of rain. Mostly cloudy, with a low around 33.
  • Friday A slight chance of rain. 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. Partly sunny, with a high near 44.