National Weather Service United States Department of Commerce

Heavy rain and flash flooding possible in the Desert Southwest and Great Lake States this evening and tonight

A slow moving cold front may bring heavy rain and localized flooding Wednesday to portions of the Great Plains. More heavy rain will be possible in the Desert Southwest again Wednesday. Hot temperatures will continue in the Mississippi Valley - and spread up the east coast Wednesday.
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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

Clear

Clear

Low: 11 °C

Wednesday

Sunny

Sunny

High: 27 °C

Wednesday
Night

Clear

Clear

Low: 12 °C

Thursday

Sunny

Sunny

High: 28 °C

Thursday
Night

Partly Cloudy

Partly
Cloudy

Low: 12 °C

Friday

Mostly Sunny

Mostly
Sunny

High: 23 °C

Friday
Night

Slight Chance Showers Chance for Measurable Precipitation 20%

Slight Chc
Showers

Low: 12 °C

Saturday

Chance Thunderstorms

Chance
Thunderstorms

High: 23 °C

Saturday
Night

Chance Thunderstorms

Chance
Thunderstorms

Low: 10 °C

Detailed Forecast

  • Overnight Clear, with a low around 11. South wind around 11 km/h.
  • Wednesday Sunny, with a high near 27. South southwest wind 8 to 14 km/h becoming west in the afternoon.
  • Wednesday Night Clear, with a low around 12. Calm wind becoming south southwest 5 to 10 km/h after midnight.
  • Thursday Sunny, with a high near 28. South southwest wind 8 to 14 km/h becoming west northwest in the afternoon.
  • Thursday Night Partly cloudy, with a low around 12. West southwest wind 10 to 16 km/h.
  • Friday Mostly sunny, with a high near 23.
  • Friday Night A 20 percent chance of showers after midnight. Partly cloudy, with a low around 12.
  • Saturday A chance of showers and thunderstorms. Mostly sunny, with a high near 23.
  • Saturday Night A chance of showers and thunderstorms. Mostly cloudy, with a low around 10.
  • Sunday A chance of showers. Partly sunny, with a high near 17.
  • Sunday Night A chance of showers. Mostly cloudy, with a low around 8.
  • Labor Day A chance of showers and thunderstorms. Mostly sunny, with a high near 15.
  • Monday Night A chance of showers and thunderstorms. Partly cloudy, with a low around 7.
  • Tuesday A slight chance of showers and thunderstorms. Mostly sunny, with a high near 17.