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 MT

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 44. East southeast wind 7 to 15 mph, with gusts as high as 24 mph.

    Low: 44 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 78. East southeast wind around 6 mph becoming light and variable.

    High: 78 °F

    Mostly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 3am, then a slight chance of showers between 3am and 4am. Mostly cloudy, with a low around 47. South southwest wind 5 to 7 mph becoming west after midnight. Chance of precipitation is 40%.

    Low: 47 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 70. West northwest wind around 11 mph, with gusts as high as 21 mph.

    High: 70 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms, then a chance of showers after 9pm. Partly cloudy, with a low around 42. North northwest wind 5 to 9 mph becoming light west northwest. Winds could gust as high as 18 mph. Chance of precipitation is 30%.

    Low: 42 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Monday

    Monday: A 30 percent chance of showers, mainly after noon. Partly sunny, with a high near 63. Northwest wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 26 mph.

    High: 63 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 40. Northwest wind 11 to 16 mph becoming light and variable after midnight. Winds could gust as high as 26 mph.

    Low: 40 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 71. Calm wind becoming north northeast around 5 mph in the afternoon.

    High: 71 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 44. East southeast wind 7 to 15 mph, with gusts as high as 24 mph.
Saturday
A 30 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 78. East southeast wind around 6 mph becoming light and variable.
Saturday Night
A chance of showers and thunderstorms before 3am, then a slight chance of showers between 3am and 4am. Mostly cloudy, with a low around 47. South southwest wind 5 to 7 mph becoming west after midnight. Chance of precipitation is 40%.
Sunday
Mostly sunny, with a high near 70. West northwest wind around 11 mph, with gusts as high as 21 mph.
Sunday Night
A slight chance of showers and thunderstorms, then a chance of showers after 9pm. Partly cloudy, with a low around 42. North northwest wind 5 to 9 mph becoming light west northwest. Winds could gust as high as 18 mph. Chance of precipitation is 30%.
Monday
A 30 percent chance of showers, mainly after noon. Partly sunny, with a high near 63. Northwest wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 26 mph.
Monday Night
Mostly clear, with a low around 40. Northwest wind 11 to 16 mph becoming light and variable after midnight. Winds could gust as high as 26 mph.
Tuesday
Sunny, with a high near 71. Calm wind becoming north northeast around 5 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 43.
Wednesday
Mostly sunny, with a high near 78.
Wednesday Night
Partly cloudy, with a low around 46.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 82.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 49.
Friday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 82.
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MT
 47.07°N 109.43°W (Elev. 3898 ft)
Last Update:
12:32 pm MDT Jun 19, 2026
Forecast Valid:
3pm MDT Jun 19, 2026-6pm MDT Jun 26, 2026
 
Forecast Discussion
 
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Additional Resources

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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