National Weather Service United States Department of Commerce

The flash flooding threat will begin moving east out of the Plains into the Upper Midwest and Great Lakes on Thursday

Flash flooding will continue to be possible on Thursday but will begin moving out of the central and northern Plains. The area of concern will be the Upper Midwest edging into the the eastern Great Lakes region. 1 to 2 inches of rainfall will be possible into 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

Today

Sunny

Sunny

High: 28 °C

Tonight

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

Low: 11 °C

Friday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 24 °C

Friday
Night

Mostly Clear

Mostly
Clear

Low: 11 °C

Saturday

Chance Showers Chance for Measurable Precipitation 40%

Chance
Showers

High: 20 °C

Saturday
Night

Chance Showers Chance for Measurable Precipitation 30%

Chance
Showers

Low: 8 °C

Sunday

Mostly Sunny

Mostly
Sunny

High: 18 °C

Sunday
Night

Partly Cloudy

Partly
Cloudy

Low: 7 °C

Labor
Day

Slight Chance Thunderstorms

Slight Chc
Thunderstorms

High: 18 °C

Detailed Forecast

  • Today Sunny, with a high near 28. South southwest wind 11 to 21 km/h becoming west in the afternoon. Winds could gust as high as 34 km/h.
  • Tonight A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 11. West northwest wind 11 to 16 km/h becoming light and variable after midnight.
  • Friday A slight chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 24. Light and variable wind becoming southeast 9 to 14 km/h in the morning. Chance of precipitation is 20%.
  • Friday Night Mostly clear, with a low around 11. East southeast wind 10 to 16 km/h.
  • Saturday A 40 percent chance of showers. Mostly cloudy, with a high near 20. South southeast wind 8 to 13 km/h becoming west northwest 16 to 21 km/h in the afternoon. Winds could gust as high as 29 km/h.
  • Saturday Night A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 8. Chance of precipitation is 30%.
  • Sunday Mostly sunny, with a high near 18.
  • Sunday Night Partly cloudy, with a low around 7.
  • Labor Day A slight chance of showers and thunderstorms. Mostly sunny, with a high near 18.
  • Monday Night A slight chance of showers and thunderstorms. Partly cloudy, with a low around 8.
  • Tuesday Sunny, with a high near 20.
  • Tuesday Night Partly cloudy, with a low around 9.
  • Wednesday A slight chance of showers and thunderstorms. Mostly sunny, with a high near 22.