National Weather Service United States Department of Commerce

Wet weather continues across Pacific Northwest and New England

Two developing storm systems will continue to bring heavy rain to opposite coasts of the U.S. on Thursday. One system is affecting the Pacific Northwest and northern California while the other affects New England. There is a risk of flash flooding across parts of New England on Thursday where Flash Flood Watches are in effect.
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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

Mostly Clear

Mostly
Clear

Low: 4 °C

Thursday

Partly Sunny

Partly
Sunny

High: 19 °C

Thursday
Night

Mostly Cloudy

Mostly
Cloudy

Low: 6 °C

Friday

Mostly Sunny

Mostly
Sunny

High: 15 °C

Friday
Night

Partly Cloudy

Partly
Cloudy

Low: 3 °C

Saturday

Mostly Sunny

Mostly
Sunny

High: 18 °C

Saturday
Night

Partly Cloudy

Partly
Cloudy

Low: 6 °C

Sunday

Slight Chance Showers

Slight Chc
Showers

High: 14 °C

Sunday
Night

Slight Chance Showers

Slight Chc
Showers

Low: 1 °C

Detailed Forecast

  • Tonight Mostly clear, with a low around 4. South wind 13 to 16 km/h.
  • Thursday Partly sunny, with a high near 19. South southwest wind 16 to 26 km/h, with gusts as high as 37 km/h.
  • Thursday Night Mostly cloudy, with a low around 6. West southwest wind 14 to 18 km/h.
  • Friday Mostly sunny, with a high near 15. West wind 16 to 26 km/h, with gusts as high as 37 km/h.
  • Friday Night Partly cloudy, with a low around 3. West wind around 13 km/h becoming south after midnight.
  • Saturday Mostly sunny, with a high near 18.
  • Saturday Night Partly cloudy, with a low around 6.
  • Sunday A slight chance of showers. Partly sunny, with a high near 14.
  • Sunday Night A slight chance of showers. Mostly cloudy, with a low around 1.
  • Monday A slight chance of showers. Mostly sunny, with a high near 8.
  • Monday Night Partly cloudy, with a low around -2.
  • Tuesday Mostly sunny, with a high near 11.
  • Tuesday Night Mostly cloudy, with a low around 2.
  • Wednesday A chance of showers. Mostly cloudy, with a high near 10.