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.

Clear

78°F

26°C

Humidity 31%
Wind Speed N 0 MPH
Barometer 30.07 in (1018.29 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 13 Jul 08:54 PM MDT
Extended Forecast for

Lewistown MT

  • Tonight

    Tonight: Mostly clear, with a low around 58. Northeast wind around 6 mph becoming south after midnight.

    Low: 58 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 90. South wind 5 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph.

    High: 90 °F

    Sunny then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm. Cloudy, with a low around 50. Northwest wind 9 to 11 mph becoming north northeast in the evening. Winds could gust as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 50 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers, with thunderstorms also possible after noon. High near 58. Northeast wind 9 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.

    High: 58 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 3am, then showers likely. Low around 45. East northeast wind 6 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 80%.

    Low: 45 °F

    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 61. East wind 6 to 8 mph. Chance of precipitation is 50%.

    High: 61 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43. East wind 6 to 8 mph.

    Low: 43 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 74. Light and variable wind becoming north 5 to 7 mph in the afternoon.

    High: 74 °F

    Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 48.

    Low: 48 °F

    Slight Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 58. Northeast wind around 6 mph becoming south after midnight.
Monday
A 20 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 90. South wind 5 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph.
Monday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 50. Northwest wind 9 to 11 mph becoming north northeast in the evening. Winds could gust as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
Showers, with thunderstorms also possible after noon. High near 58. Northeast wind 9 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.
Tuesday Night
Showers and possibly a thunderstorm before 3am, then showers likely. Low around 45. East northeast wind 6 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 80%.
Wednesday
A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 61. East wind 6 to 8 mph. Chance of precipitation is 50%.
Wednesday Night
Partly cloudy, with a low around 43. East wind 6 to 8 mph.
Thursday
Sunny, with a high near 74. Light and variable wind becoming north 5 to 7 mph in the afternoon.
Thursday Night
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 48.
Friday
Mostly sunny, with a high near 78.
Friday Night
Mostly clear, with a low around 52.
Saturday
Sunny, with a high near 83.
Saturday Night
Partly cloudy, with a low around 54.
Sunday
A slight chance of showers and thunderstorms. Sunny, with a high near 86.
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MT
 47.07°N 109.43°W (Elev. 3898 ft)
Last Update:
8:40 pm MDT Jul 13, 2025
Forecast Valid:
9pm MDT Jul 13, 2025-6pm MDT Jul 20, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation