National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Lake Effect Snow through Friday; Heavy Rain, Thunderstorms and Mountain Snow in California

Periods of moderate to heavy lake effect snow will continue through Friday downwind of Lake Erie and Ontario. Several additional inches of accumulating snow are expected. A Pacific storm will bring heavy rain and mountain snow across California, the Southwest and Intermountain West today. Isolated severe thunderstorms and scattered flash flooding is possible across parts of southern California. Read More >

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

Lat: 47.04917°NLon: 109.46639°WElev: 4167.0ft.

Clear

27°F

-3°C

Humidity 63%
Wind Speed SSW 4 MPH
Barometer 29.88 in (1011.85 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 01 Jan 06:20 AM MST
Extended Forecast for

Lewistown Municipal MT

  • New Year's Day

    New Year's Day: Mostly sunny, with a high near 49. Light and variable wind becoming east southeast 5 to 7 mph in the afternoon.

    High: 49 °F

    Mostly Sunny

  • Tonight

    Tonight: A chance of rain and snow, mainly after 4am. Mostly cloudy, with a steady temperature around 37. South wind around 6 mph becoming west southwest in the evening. Chance of precipitation is 30%. Little or no snow accumulation expected.

    Low: 37 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Friday

    Friday: A slight chance of rain and snow before 2pm, then a slight chance of rain between 2pm and 3pm. Mostly cloudy, with a high near 51. West wind 7 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.

    High: 51 °F

    Slight Chance
    Rain/Snow
    then Slight
    Chance Rain

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 32. West wind 7 to 13 mph, with gusts as high as 22 mph.

    Low: 32 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 51. South southwest wind 7 to 10 mph, with gusts as high as 18 mph.

    High: 51 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 34. South southwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 34 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 53. South southwest wind 10 to 13 mph, with gusts as high as 22 mph.

    High: 53 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 34. South southwest wind around 10 mph, with gusts as high as 18 mph.

    Low: 34 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 50.

    High: 50 °F

    Partly Sunny

Detailed Forecast

New Year's Day
Mostly sunny, with a high near 49. Light and variable wind becoming east southeast 5 to 7 mph in the afternoon.
Tonight
A chance of rain and snow, mainly after 4am. Mostly cloudy, with a steady temperature around 37. South wind around 6 mph becoming west southwest in the evening. Chance of precipitation is 30%. Little or no snow accumulation expected.
Friday
A slight chance of rain and snow before 2pm, then a slight chance of rain between 2pm and 3pm. Mostly cloudy, with a high near 51. West wind 7 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.
Friday Night
Mostly cloudy, with a low around 32. West wind 7 to 13 mph, with gusts as high as 22 mph.
Saturday
Partly sunny, with a high near 51. South southwest wind 7 to 10 mph, with gusts as high as 18 mph.
Saturday Night
Mostly cloudy, with a low around 34. South southwest wind around 10 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny, with a high near 53. South southwest wind 10 to 13 mph, with gusts as high as 22 mph.
Sunday Night
Partly cloudy, with a low around 34. South southwest wind around 10 mph, with gusts as high as 18 mph.
Monday
Partly sunny, with a high near 50.
Monday Night
Mostly cloudy, with a low around 29.
Tuesday
Mostly sunny, with a high near 45.
Tuesday Night
Partly cloudy, with a low around 29.
Wednesday
Partly sunny, with a high near 45.
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown Municipal MT
 47.04°N 109.45°W (Elev. 4111 ft)
Last Update:
3:32 am MST Jan 1, 2026
Forecast Valid:
6am MST Jan 1, 2026-6pm MST Jan 7, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation