National Weather Service United States Department of Commerce

Arctic air to drop temperatures across the northern Plain and northern Rockies; will bring snow to the Intermountain West

An arctic front is forecast to plunge through the northern Plains and northern Rockies on Saturday bringing a drastic drop in temperatures across these areas with a burst of snow over much of the Intermountain Region. Arctic air will also filter into the Pacific Northwest bringing with it snow showers and subfreezing low temperatures.
Read More...

Current Conditions

En Español

Share |

Lewistown MT

7 Day Forecast

For More Weather Information:

Great Falls, MT Local Forecast Office

Overnight

Snow Likely Chance for Measurable Precipitation 60%

Snow
Likely

Low: 7 °F

Saturday

Snow Chance for Measurable Precipitation 100%

Snow

High: 5 °FFalling Temperatures

Saturday
Night

Chance Snow Chance for Measurable Precipitation 40%

Chance
Snow

Low: -11 °F

Sunday

Sunny

Sunny

High: 12 °F

Sunday
Night

Partly Cloudy

Partly
Cloudy

Low: 0 °F

Monday

Mostly Sunny

Mostly
Sunny

High: 35 °F

Monday
Night

Chance Snow Chance for Measurable Precipitation 30%

Chance
Snow

Low: 18 °F

Tuesday

Slight Chance Snow

Slight Chc
Snow

High: 31 °F

Tuesday
Night

Mostly Cloudy

Mostly
Cloudy

Low: 12 °F

Detailed Forecast

  • Overnight Snow likely. Cloudy, with a steady temperature around 7. Wind chill values as low as -11. West wind around 15 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. Total nighttime snow accumulation of less than a half inch possible.
  • Saturday Snow. Temperature falling to around -3 by 4pm. Wind chill values as low as -23. Northwest wind 13 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New snow accumulation of around an inch possible.
  • Saturday Night A 40 percent chance of snow, mainly before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around -11. Wind chill values as low as -27. West wind 7 to 13 mph, with gusts as high as 18 mph. New snow accumulation of less than a half inch possible.
  • Sunday Sunny, with a high near 12. Wind chill values as low as -11. West northwest wind around 8 mph.
  • Sunday Night Partly cloudy, with a low around 0. South wind 7 to 10 mph.
  • Monday Mostly sunny, with a high near 35.
  • Monday Night A 30 percent chance of snow. Mostly cloudy, with a low around 18. New snow accumulation of less than a half inch possible.
  • Tuesday A slight chance of snow showers. Partly sunny, with a high near 31.
  • Tuesday Night Mostly cloudy, with a low around 12.
  • Wednesday A slight chance of snow showers. Mostly sunny, with a high near 33.
  • Wednesday Night Mostly cloudy, with a low around 22.
  • Thursday Partly sunny, with a high near 37.
  • Thursday Night Mostly cloudy, with a low around 23.
  • Friday Mostly sunny, with a high near 37.