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

Lewistown, Lewistown Municipal Airport (KLWT)

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

Partly Cloudy

N/A

Humidity 41%
Wind Speed SE 4 MPH
Barometer NA
Dewpoint N/A
Visibility 10.00 mi
Last update 08 Jun 08:40 PM MDT
Extended Forecast for

Lewistown Municipal MT

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly after 5am. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 45. East southeast wind around 5 mph becoming calm after midnight.

    Low: 45 °F

    Slight Chance
    T-storms then
    Chance
    Showers and
    Patchy Fog

  • Monday

    Monday: A chance of showers before 9am, then a chance of showers and thunderstorms between 9am and 5pm. Patchy fog before 7am. Otherwise, partly sunny, with a high near 63. Light west wind becoming northwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 50%.

    High: 63 °F

    Chance
    Showers and
    Patchy Fog
    then Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 40. North northwest wind 5 to 10 mph becoming west southwest after midnight. Winds could gust as high as 20 mph.

    Low: 40 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 67. West wind 6 to 9 mph becoming north northwest in the afternoon. Winds could gust as high as 18 mph.

    High: 67 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 42. North wind 5 to 8 mph becoming light and variable.

    Low: 42 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 72. South southeast wind around 5 mph becoming light and variable.

    High: 72 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 47. East wind 6 to 10 mph, with gusts as high as 18 mph.

    Low: 47 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of showers and thunderstorms after noon. Partly sunny, with a high near 76. Southeast wind around 6 mph becoming northwest in the afternoon.

    High: 76 °F

    Partly Sunny
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 50.

    Low: 50 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

Detailed Forecast

Tonight
A 40 percent chance of showers and thunderstorms, mainly after 5am. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 45. East southeast wind around 5 mph becoming calm after midnight.
Monday
A chance of showers before 9am, then a chance of showers and thunderstorms between 9am and 5pm. Patchy fog before 7am. Otherwise, partly sunny, with a high near 63. Light west wind becoming northwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 50%.
Monday Night
Partly cloudy, with a low around 40. North northwest wind 5 to 10 mph becoming west southwest after midnight. Winds could gust as high as 20 mph.
Tuesday
Mostly sunny, with a high near 67. West wind 6 to 9 mph becoming north northwest in the afternoon. Winds could gust as high as 18 mph.
Tuesday Night
Partly cloudy, with a low around 42. North wind 5 to 8 mph becoming light and variable.
Wednesday
Mostly sunny, with a high near 72. South southeast wind around 5 mph becoming light and variable.
Wednesday Night
Partly cloudy, with a low around 47. East wind 6 to 10 mph, with gusts as high as 18 mph.
Thursday
A chance of showers and thunderstorms after noon. Partly sunny, with a high near 76. Southeast wind around 6 mph becoming northwest in the afternoon.
Thursday Night
A slight chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 50.
Friday
A chance of showers and thunderstorms after noon. Partly sunny, with a high near 79.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 47.
Saturday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 66.
Saturday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 41.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 58.
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown Municipal MT
 47.04°N 109.45°W (Elev. 4111 ft)
Last Update:
4:47 pm MDT Jun 21, 2026
Forecast Valid:
8pm MDT Jun 21, 2026-6pm MDT Jun 28, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation