National Weather Service United States Department of Commerce

Rainfall and mountain snow will continue across the western U.S. into Monday

Heavy precipitation along the west coast will persist with a focus along the Coastal Ranges and Cascades. While not nearly as impressive as recent days, the forecast suggests another 1 to 3 inches of rainfall is possible across this region. Farther inland, moderate to heavy snow is likely over the Wasatch and Colorado Rockies with 1 to 2 foot amounts possible through Monday.
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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 Rain/Snow Chance for Measurable Precipitation 40%

Chance
Rain/Snow

Low: -2 °C

Monday

Chance Snow Chance for Measurable Precipitation 30%

Chance
Snow

High: 3 °C

Monday
Night

Slight Chance Snow Chance for Measurable Precipitation 20%

Slight Chc
Snow

Low: -7 °C

Tuesday

Mostly Sunny

Mostly
Sunny

High: 2 °C

Tuesday
Night

Mostly Cloudy

Mostly
Cloudy

Low: -3 °C

Wednesday

Rain/Snow Likely Chance for Measurable Precipitation 60%

Rain/Snow
Likely

High: 4 °C

Wednesday
Night

Snow Chance for Measurable Precipitation 80%

Snow

Low: -5 °C

Christmas
Day

Snow Likely

Snow
Likely

High: -3 °C

Thursday
Night

Slight Chance Snow

Slight Chc
Snow

Low: -9 °C

Detailed Forecast

  • Tonight A chance of rain and snow showers before 11pm, then a slight chance of snow showers. Mostly cloudy, with a low around -2. Blustery, with a west northwest wind 39 to 42 km/h, with gusts as high as 70 km/h. Chance of precipitation is 40%. Total nighttime snow accumulation of less than a half centimeter possible.
  • Monday A 30 percent chance of snow showers, mainly after 11am. Partly sunny, with a high near 3. Breezy, with a west northwest wind 34 to 37 km/h, with gusts as high as 50 km/h. New snow accumulation of less than a half centimeter possible.
  • Monday Night A 20 percent chance of snow showers. Mostly cloudy, with a low around -7. West northwest wind 24 to 26 km/h, with gusts as high as 37 km/h.
  • Tuesday Mostly sunny, with a high near 2. West southwest wind 13 to 16 km/h.
  • Tuesday Night Mostly cloudy, with a low around -3. West southwest wind 18 to 24 km/h, with gusts as high as 34 km/h.
  • Wednesday Snow likely before 11am, then rain likely. Mostly cloudy, with a high near 4. Chance of precipitation is 60%. New snow accumulation of less than one centimeter possible.
  • Wednesday Night Snow. Low around -5. Chance of precipitation is 80%. New snow accumulation of 5 to 9 centimeters possible.
  • Christmas Day Snow likely. Cloudy, with a high near -3.
  • Thursday Night A slight chance of snow. Mostly cloudy, with a low around -9.
  • Friday A slight chance of snow. Partly sunny, with a high near -3.
  • Friday Night Mostly cloudy, with a low around -11.
  • Saturday Partly sunny, with a high near -3.
  • Saturday Night Mostly cloudy, with a low around -11.
  • Sunday Mostly cloudy, with a high near -2.