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National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 47.07°N 109.43°W (Text-Only)
NWS Forecast for: Lewistown MT
Issued by: National Weather Service Great Falls, MT
Last Update: 1:52 am MDT Jun 30, 2026		Print

  • Overnight

    Overnight: A 30 percent chance of showers, mainly before 5am. Cloudy, with a steady temperature around 54. West wind around 17 mph, with gusts as high as 28 mph.

    Low: 54 °F

    Chance
    Showers


  • Tuesday

    Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 71. West northwest wind 8 to 17 mph, with gusts as high as 28 mph.

    High: 71 °F

    Decreasing
    Clouds


  • Tuesday
    Night

    Tuesday Night: Partly cloudy, with a low around 46. West northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 46 °F

    Partly Cloudy



  • Wednesday

    Wednesday: Showers and thunderstorms likely, mainly before 4pm. Increasing clouds, with a high near 73. Light and variable wind. Chance of precipitation is 60%.

    High: 73 °F

    Mostly Sunny
    then Showers
    Likely

  • Wednesday
    Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 46. Light and variable wind. Chance of precipitation is 50%.

    Low: 46 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 76. Calm wind becoming west around 5 mph in the afternoon.

    High: 76 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday
    Night

    Thursday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Partly cloudy, with a low around 48. Light and variable wind. Chance of precipitation is 20%.

    Low: 48 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: Showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 76. Light and variable wind.

    High: 76 °F

    Partly Sunny
    then Showers
    Likely

  • Friday
    Night

    Friday Night: A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Chance
    T-storms then
    Partly Cloudy

    • Overnight: A 30 percent chance of showers, mainly before 5am. Cloudy, with a steady temperature around 54. West wind around 17 mph, with gusts as high as 28 mph.

    Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 71. West northwest wind 8 to 17 mph, with gusts as high as 28 mph.

    Tuesday Night: Partly cloudy, with a low around 46. West northwest wind 5 to 7 mph becoming calm in the evening.

    Wednesday: Showers and thunderstorms likely, mainly before 4pm. Increasing clouds, with a high near 73. Light and variable wind. Chance of precipitation is 60%.

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 46. Light and variable wind. Chance of precipitation is 50%.

    Thursday: A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 76. Calm wind becoming west around 5 mph in the afternoon.

    Thursday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Partly cloudy, with a low around 48. Light and variable wind. Chance of precipitation is 20%.

    Friday: Showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 76. Light and variable wind.

    Friday Night: A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 47.

    Independence Day: Sunny, with a high near 77.

    Saturday Night: Mostly clear, with a low around 49.

    Sunday: Sunny, with a high near 85.

    Sunday Night: Mostly clear, with a low around 53.

    Monday: Sunny, with a high near 85.


    Lewistown MT
     47.07°N 109.43°W (Elev. 3898 ft)

    Visit your local NWS office at: https://www.weather.gov/tfx