National Weather Service United States Department of Commerce

A stalled frontal boundary and ample monsoonal moisture will lead to flash flood potential from the Great Basin to the Great Plains tonight and Tuesday

A stalled frontal boundary will set up along the southern and central Rockies for the next couple of days providing focus for showers and thunderstorms. In addition, ample monsoonal moisture will stream in across the southwest bringing enough moisture to introduce a flash flood threat from the Great Basin and Southwest eastward across the central and southern Rockies into the adjacent Plains.
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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

Partly Cloudy

Partly
Cloudy

Low: 13 °C

Tuesday

Sunny

Sunny

High: 31 °C

Tuesday
Night

Mostly Clear

Mostly
Clear

Low: 13 °C

Wednesday

Sunny

Sunny

High: 31 °C

Wednesday
Night

Mostly Clear

Mostly
Clear

Low: 13 °C

Thursday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 31 °C

Thursday
Night

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

Low: 12 °C

Friday

Slight Chance Thunderstorms

Slight Chc
Thunderstorms

High: 29 °C

Friday
Night

Slight Chance Thunderstorms

Slight Chc
Thunderstorms

Low: 12 °C

Detailed Forecast

  • Tonight Partly cloudy, with a low around 13. East southeast wind 13 to 16 km/h.
  • Tuesday Sunny, with a high near 31. Southeast wind 11 to 14 km/h.
  • Tuesday Night Mostly clear, with a low around 13. East southeast wind 11 to 13 km/h.
  • Wednesday Sunny, with a high near 31. Southeast wind around 11 km/h.
  • Wednesday Night Mostly clear, with a low around 13. East southeast wind 11 to 14 km/h.
  • Thursday A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 31.
  • Thursday Night A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 12.
  • Friday A slight chance of showers and thunderstorms. Mostly sunny, with a high near 29.
  • Friday Night A slight chance of showers and thunderstorms. Partly cloudy, with a low around 12.
  • Saturday A slight chance of showers and thunderstorms. Mostly sunny, with a high near 28.
  • Saturday Night A slight chance of showers and thunderstorms. Partly cloudy, with a low around 12.
  • Sunday A slight chance of showers and thunderstorms. Mostly sunny, with a high near 29.
  • Sunday Night A slight chance of showers and thunderstorms. Partly cloudy, with a low around 12.
  • Monday Mostly sunny, with a high near 29.