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Heavy Rain and Thunderstorms in the Plains; Snow in the Northern Rockies

A storm system moving eastward will bring widespread showers and thunderstorms over parts of the Northern Plains to the Southern Plains and Upper Great Lakes through Friday. Heavy snow will continue over parts of the Northern Rockies. Read More >

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

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

Mist

37°F

3°C

Humidity 100%
Wind Speed WNW 3 MPH
Barometer 29.96 in (1014.56 mb)
Dewpoint 37°F (3°C)
Visibility 4.00 mi
Last update 16 Oct 03:20 AM MDT
Extended Forecast for

Lewistown MT

  • Overnight

    Overnight: A 40 percent chance of rain, mainly between 4am and 5am. Patchy fog. Otherwise, cloudy, with a steady temperature around 37. West wind 3 to 5 mph.

    Low: 37 °F

    Chance Rain
    and Patchy
    Fog

  • Thursday

    Thursday: A chance of rain between 7am and 3pm. Cloudy, with a high near 48. West wind 6 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 50%.

    High: 48 °F

    Chance Rain

  • Thursday Night

    Thursday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 32. Southwest wind 6 to 13 mph, with gusts as high as 22 mph.

    Low: 32 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 57. West northwest wind 13 to 18 mph, with gusts as high as 28 mph.

    High: 57 °F

    Sunny

  • Friday Night

    Friday Night: A chance of rain before 3am, then a chance of rain and snow. Mostly cloudy, with a low around 28. West northwest wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.

    Low: 28 °F

    Chance Rain
    then Chance
    Rain/Snow

  • Saturday

    Saturday: Sunny, with a high near 51. West wind around 11 mph, with gusts as high as 21 mph.

    High: 51 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 34. South southwest wind 5 to 14 mph, with gusts as high as 22 mph.

    Low: 34 °F

    Partly Cloudy

  • Sunday

    Sunday: A slight chance of rain after noon. Partly sunny, with a high near 64. South southwest wind around 15 mph, with gusts as high as 24 mph.

    High: 64 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Sunday Night

    Sunday Night: A chance of rain. Mostly cloudy, with a low around 33.

    Low: 33 °F

    Chance Rain

Detailed Forecast

Overnight
A 40 percent chance of rain, mainly between 4am and 5am. Patchy fog. Otherwise, cloudy, with a steady temperature around 37. West wind 3 to 5 mph.
Thursday
A chance of rain between 7am and 3pm. Cloudy, with a high near 48. West wind 6 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 50%.
Thursday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 32. Southwest wind 6 to 13 mph, with gusts as high as 22 mph.
Friday
Sunny, with a high near 57. West northwest wind 13 to 18 mph, with gusts as high as 28 mph.
Friday Night
A chance of rain before 3am, then a chance of rain and snow. Mostly cloudy, with a low around 28. West northwest wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.
Saturday
Sunny, with a high near 51. West wind around 11 mph, with gusts as high as 21 mph.
Saturday Night
Partly cloudy, with a low around 34. South southwest wind 5 to 14 mph, with gusts as high as 22 mph.
Sunday
A slight chance of rain after noon. Partly sunny, with a high near 64. South southwest wind around 15 mph, with gusts as high as 24 mph.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 33.
Monday
A chance of rain. Mostly cloudy, with a high near 45.
Monday Night
A slight chance of rain. Partly cloudy, with a low around 28.
Tuesday
Mostly sunny, with a high near 51.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
Mostly sunny, with a high near 55.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MT
 47.05°N 109.42°W (Elev. 4075 ft)
Last Update:
2:11 am MDT Oct 16, 2025
Forecast Valid:
3am MDT Oct 16, 2025-6pm MDT Oct 22, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation