National Weather Service United States Department of Commerce

Unsettled weather moving into the western and central U.S.

Increasing moisture and colder air will filter into the Pacific Northwest Friday and into Saturday. Expect rain to start near the coast and then begin to spread steadily to the south and east into the interior mountains as snow Friday into Saturday. Enough moisture will be pushed eastward to also see snow in the central and southern Rockies and adjacent Plains 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

Overnight

Mostly Clear

Mostly
Clear

Low: -1 °F

Friday

Mostly Sunny

Mostly
Sunny

High: 23 °F

Friday
Night

Chance Snow Chance for Measurable Precipitation 30%

Chance
Snow

Low: 1 °F

Saturday

Slight Chance Snow Chance for Measurable Precipitation 20%

Slight Chc
Snow

High: 17 °F

Saturday
Night

Partly Cloudy

Partly
Cloudy

Low: 1 °F

Sunday

Sunny

Sunny

High: 30 °F

Sunday
Night

Mostly Clear

Mostly
Clear

Low: 10 °F

Monday

Mostly Sunny

Mostly
Sunny

High: 34 °F

Monday
Night

Snow Likely

Snow
Likely

Low: 6 °F

Detailed Forecast

  • Overnight Mostly clear, with a low around -1. Wind chill values as low as -16. South southeast wind around 9 mph.
  • Friday Mostly sunny, with a high near 23. Wind chill values as low as -16. South wind 5 to 10 mph becoming northwest in the afternoon.
  • Friday Night A 30 percent chance of snow showers. Mostly cloudy, with a low around 1. Wind chill values as low as -11. North northwest wind 8 to 11 mph. New snow accumulation of less than a half inch possible.
  • Saturday A 20 percent chance of snow showers before 11am. Mostly cloudy, with a high near 17. Wind chill values as low as -15. West northwest wind around 11 mph.
  • Saturday Night Partly cloudy, with a low around 1. West wind around 10 mph.
  • Sunday Sunny, with a high near 30.
  • Sunday Night Mostly clear, with a low around 10.
  • Monday Mostly sunny, with a high near 34.
  • Monday Night Snow likely. Mostly cloudy, with a low around 6.
  • Tuesday Snow showers likely. Mostly cloudy and cold, with a high near 10.
  • Tuesday Night A slight chance of snow showers. Mostly cloudy, with a low around -4.
  • Wednesday Mostly sunny, with a high near 21.
  • Wednesday Night Mostly cloudy, with a low around 9.
  • Thursday Mostly sunny, with a high near 35.