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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St Mary MT

7 Day Forecast

For More Weather Information:

Great Falls, MT Local Forecast Office

This
Afternoon

Snow Chance for Measurable Precipitation 100%

Snow

High: 21 °F

Tonight

Blowing Snow Chance for Measurable Precipitation 30%

Blowing
Snow

Low: -5 °F

Monday

Cold

Cold

High: 3 °F

Monday
Night

Partly Cloudy

Partly
Cloudy

Low: -17 °F

Tuesday

Cold

Cold

High: 9 °F

Tuesday
Night

Partly Cloudy

Partly
Cloudy

Low: 2 °F

Wednesday

Mostly Sunny

Mostly
Sunny

High: 23 °F

Wednesday
Night

Mostly Cloudy

Mostly
Cloudy

Low: 12 °F

New Year's
Day

Slight Chance Snow

Slight Chc
Snow

High: 21 °F

Detailed Forecast

  • This Afternoon Snow with areas of blowing snow. High near 21. North wind 13 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. Total daytime snow accumulation of 1 to 3 inches possible.
  • Tonight Areas of blowing snow and a chance of snow before 11pm, then a slight chance of snow after 11pm. Mostly cloudy, with a low around -5. Wind chill values as low as -15. North wind 13 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.
  • Monday Partly sunny and cold, with a high near 3. Wind chill values as low as -27. North northeast wind 9 to 11 mph.
  • Monday Night Partly cloudy, with a low around -17. North wind around 8 mph.
  • Tuesday Partly sunny and cold, with a high near 9. Southwest wind 3 to 5 mph.
  • Tuesday Night Partly cloudy, with a low around 2.
  • Wednesday Mostly sunny, with a high near 23.
  • Wednesday Night Mostly cloudy, with a low around 12.
  • New Year's Day A slight chance of snow. Partly sunny, with a high near 21.
  • Thursday Night A chance of snow. Mostly cloudy, with a low around 12.
  • Friday Snow likely. Mostly cloudy, with a high near 17.
  • Friday Night A chance of snow. Mostly cloudy, with a low around -1.
  • Saturday A chance of snow. Partly sunny and cold, with a high near 10.