National Weather Service United States Department of Commerce

Active pattern for the Pacific Northwest this week while a coastal low takes aim on the Northeast later this week

Thunderstorms with heavy rainfall is forecast to bring 5 to 7 inches of rainfall, with localized heavier amounts, to the Pacific Northwest throughout the week. Across the higher mountain elevations, measurable snow is likely. The Northeast will also be the focus of showers and thunderstorms beginning mid-week as a coastal low meanders of the Mid-Atlantic coast.
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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

Chance Showers Chance for Measurable Precipitation 30%

Chance
Showers

High: 20 °C

Tonight

Chance Showers Chance for Measurable Precipitation 50%

Chance
Showers

Low: 2 °C

Wednesday

Mostly Sunny

Mostly
Sunny

High: 16 °C

Wednesday
Night

Partly Cloudy

Partly
Cloudy

Low: 4 °C

Thursday

Mostly Sunny

Mostly
Sunny

High: 19 °C

Thursday
Night

Mostly Cloudy

Mostly
Cloudy

Low: 5 °C

Friday

Mostly Sunny

Mostly
Sunny

High: 16 °C

Friday
Night

Partly Cloudy

Partly
Cloudy

Low: 5 °C

Saturday

Mostly Sunny

Mostly
Sunny

High: 19 °C

Detailed Forecast

  • Today A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 20. South wind 11 to 21 km/h becoming west in the afternoon.
  • Tonight A 50 percent chance of showers. Mostly cloudy, with a low around 2. West southwest wind 13 to 23 km/h, with gusts as high as 32 km/h.
  • Wednesday Mostly sunny, with a high near 16. Southwest wind 11 to 14 km/h.
  • Wednesday Night Partly cloudy, with a low around 4. South southwest wind around 11 km/h.
  • Thursday Mostly sunny, with a high near 19. South southwest wind 13 to 18 km/h.
  • Thursday Night Mostly cloudy, with a low around 5.
  • Friday Mostly sunny, with a high near 16.
  • Friday Night Partly cloudy, with a low around 5.
  • Saturday Mostly sunny, with a high near 19.
  • Saturday Night Partly cloudy, with a low around 3.
  • Sunday Partly sunny, with a high near 13.
  • Sunday Night Mostly cloudy, with a low around 0.
  • Monday Mostly sunny, with a high near 11.