National Weather Service United States Department of Commerce

Unsettled weather forecast across eastern U.S.

A storm system moving across the Great Lakes will bring unsettled weather to parts of the eastern U.S. on Monday, with widespread rain is expected across much of the Northeast. Snow is likely across Wisconsin and the western Great Lakes. Snow is also expected across the central and northern Rockies Monday into Tuesday.
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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

This
Afternoon

Partly Sunny

Partly
Sunny

High: 3 °C

Tonight

Chance Snow Chance for Measurable Precipitation 40%

Chance
Snow

Low: -3 °C

Tuesday

Chance Snow Chance for Measurable Precipitation 50%

Chance
Snow

High: 3 °C

Tuesday
Night

Snow Likely Chance for Measurable Precipitation 70%

Snow
Likely

Low: -5 °C

Wednesday

Snow Chance for Measurable Precipitation 100%

Snow

High: 1 °C

Wednesday
Night

Snow Likely Chance for Measurable Precipitation 60%

Snow
Likely

Low: -7 °C

Thanksgiving
Day

Slight Chance Rain/Snow Chance for Measurable Precipitation 20%

Slight Chc
Rain/Snow

High: 6 °C

Thursday
Night

Partly Cloudy

Partly
Cloudy

Low: -4 °C

Friday

Chance Showers

Chance
Showers

High: 1 °C

Detailed Forecast

  • This Afternoon Partly sunny, with a high near 3. West northwest wind around 26 km/h, with gusts as high as 39 km/h.
  • Tonight A 40 percent chance of snow after midnight. Mostly cloudy, with a steady temperature around 0. West southwest wind 18 to 24 km/h, with gusts as high as 34 km/h. New snow accumulation of 1 to 2 centimeters possible.
  • Tuesday A 50 percent chance of snow. Mostly cloudy, with a steady temperature around 0. Northwest wind 26 to 34 km/h, with gusts as high as 50 km/h. New snow accumulation of 3 to 5 centimeters possible.
  • Tuesday Night Snow likely. Cloudy, with a low around -5. West wind 8 to 14 km/h. Chance of precipitation is 70%. New snow accumulation of 4 to 8 centimeters possible.
  • Wednesday Snow. High near 1. Southeast wind around 10 km/h. Chance of precipitation is 100%. New snow accumulation of 6 to 10 centimeters possible.
  • Wednesday Night Snow showers likely, mainly before midnight. Mostly cloudy, with a low around -7. Chance of precipitation is 60%. New snow accumulation of 2 to 4 centimeters possible.
  • Thanksgiving Day A slight chance of rain and snow showers. Mostly cloudy, with a high near 6. Chance of precipitation is 20%.
  • Thursday Night Partly cloudy, with a low around -4.
  • Friday A chance of showers. Mostly sunny, with a high near 1.
  • Friday Night A chance of snow. Mostly cloudy, with a low around -21.
  • Saturday A chance of snow. Partly sunny and cold, with a high near -16.
  • Saturday Night A slight chance of snow. Mostly cloudy, with a low around -22.
  • Sunday Partly sunny, with a high near -7.