National Weather Service United States Department of Commerce

Severe weather expected for Upper Midwest on Wednesday

A potent storm system will bring a chance of severe thunderstorms to parts of the Upper Midwest on Wednesday and Wednesday night. Very large hail, damaging wind gusts, tornadoes and heavy rain are possible with these storms.
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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

Partly Cloudy

Partly
Cloudy

Low: 9 °C

Wednesday

Chance Showers Chance for Measurable Precipitation 30%

Chance
Showers

High: 17 °C

Wednesday
Night

Slight Chance Showers Chance for Measurable Precipitation 20%

Slight Chc
Showers

Low: 5 °C

Thursday

Mostly Sunny

Mostly
Sunny

High: 17 °C

Thursday
Night

Partly Cloudy

Partly
Cloudy

Low: 6 °C

Friday

Sunny

Sunny

High: 20 °C

Friday
Night

Partly Cloudy

Partly
Cloudy

Low: 8 °C

Saturday

Mostly Sunny

Mostly
Sunny

High: 23 °C

Saturday
Night

Partly Cloudy

Partly
Cloudy

Low: 9 °C

Detailed Forecast

  • Overnight Partly cloudy, with a low around 9. East southeast wind 8 to 10 km/h.
  • Wednesday A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly sunny, with a high near 17. Breezy, with a west northwest wind 10 to 20 km/h increasing to 27 to 37 km/h. Winds could gust as high as 50 km/h. Chance of precipitation is 30%.
  • Wednesday Night A 20 percent chance of showers. Partly cloudy, with a low around 5. Breezy, with a west northwest wind 27 to 37 km/h decreasing to 13 to 23 km/h. Winds could gust as high as 50 km/h.
  • Thursday Mostly sunny, with a high near 17. Southwest wind 5 to 13 km/h.
  • Thursday Night Partly cloudy, with a low around 6. East southeast wind 11 to 16 km/h becoming south after midnight.
  • Friday Sunny, with a high near 20.
  • Friday Night Partly cloudy, with a low around 8.
  • Saturday Mostly sunny, with a high near 23.
  • Saturday Night Partly cloudy, with a low around 9.
  • Sunday Mostly sunny, with a high near 26.
  • Sunday Night Partly cloudy, with a low around 10.
  • Monday A slight chance of showers and thunderstorms. Mostly sunny, with a high near 23.
  • Monday Night A slight chance of showers and thunderstorms. Partly cloudy, with a low around 8.
  • Tuesday A slight chance of showers. Mostly sunny, with a high near 16.