National Weather Service United States Department of Commerce

Winter weather forecast for Rockies and southern Plains

A developing storm system will bring snow to parts of the Rockies and southern Plains on Friday, which will move into the central U.S. on Saturday. Freezing rain is also forecast from Texas to the mid-Mississippi Valley and into the Carolinas. Meanwhile, temperatures will be 20-40 degrees below normal across parts of the central and southern U.S. on Friday.
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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

Tonight

Chance Snow Chance for Measurable Precipitation 30%

Chance
Snow

Low: -18 °C

Saturday

Slight Chance Snow Chance for Measurable Precipitation 20%

Slight Chc
Snow

High: -9 °C

Saturday
Night

Partly Cloudy

Partly
Cloudy

Low: -17 °C

Sunday

Sunny

Sunny

High: -3 °C

Sunday
Night

Mostly Clear

Mostly
Clear

Low: -11 °C

Monday

Chance Snow Chance for Measurable Precipitation 30%

Chance
Snow

High: -1 °C

Monday
Night

Snow Likely Chance for Measurable Precipitation 60%

Snow
Likely

Low: -19 °C

Tuesday

Chance Snow

Chance
Snow

High: -13 °C

Tuesday
Night

Mostly Cloudy

Mostly
Cloudy

Low: -22 °C

Detailed Forecast

  • Tonight A 30 percent chance of snow. Mostly cloudy, with a low around -18. West northwest wind 10 to 13 km/h. Total nighttime snow accumulation of 1 to 2 centimeters possible.
  • Saturday A 20 percent chance of snow before 11am. Mostly sunny, with a high near -9. West northwest wind 13 to 18 km/h.
  • Saturday Night Partly cloudy, with a low around -17. West southwest wind 11 to 13 km/h.
  • Sunday Sunny, with a high near -3. South wind around 11 km/h.
  • Sunday Night Mostly clear, with a low around -11. South southwest wind 14 to 16 km/h.
  • Monday A 30 percent chance of snow after 11am. Mostly sunny, with a high near -1. New snow accumulation of less than one centimeter possible.
  • Monday Night Snow likely, mainly before 11pm. Cloudy, with a low around -19. Chance of precipitation is 60%. New snow accumulation of 2 to 4 centimeters possible.
  • Tuesday A chance of snow. Mostly cloudy and cold, with a high near -13.
  • Tuesday Night Mostly cloudy, with a low around -22.
  • Wednesday Mostly sunny, with a high near -4.
  • Wednesday Night Partly cloudy, with a low around -8.
  • Thursday Mostly sunny, with a high near 6.
  • Thursday Night Mostly cloudy, with a low around -3.
  • Friday Partly sunny, with a high near 7.