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

88°F

31°C

Humidity 23%
Wind Speed N 0 MPH
Barometer 29.92 in (1013.21 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 14 Jul 04:20 PM MDT
Extended Forecast for

Lewistown MT

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely after 3am. Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 50. North northeast wind 8 to 10 mph, with gusts as high as 20 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

    Chance
    T-storms then
    Showers
    Likely and
    Patchy Fog

  • Tuesday

    Tuesday: Showers, with thunderstorms also possible after 9am. Patchy fog before 8am. High near 57. Northeast wind 8 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 57 °F

    Showers and
    Patchy Fog

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Patchy fog after midnight. Low around 45. Northeast wind 6 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 45 °F

    Showers and
    Patchy Fog

  • Wednesday

    Wednesday: A 50 percent chance of showers. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 64. East northeast wind 6 to 9 mph.

    High: 64 °F

    Chance
    Showers and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 42. East southeast wind 6 to 9 mph.

    Low: 42 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 80. South southeast wind 5 to 7 mph becoming east northeast in the afternoon.

    High: 80 °F

    Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 49. East northeast wind 5 to 8 mph becoming light and variable after midnight.

    Low: 49 °F

    Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 76. Light and variable wind becoming north northwest 5 to 7 mph in the morning.

    High: 76 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

Detailed Forecast

Tonight
A chance of showers and thunderstorms, then showers likely after 3am. Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 50. North northeast wind 8 to 10 mph, with gusts as high as 20 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 9am. Patchy fog before 8am. High near 57. Northeast wind 8 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday Night
Showers and possibly a thunderstorm. Patchy fog after midnight. Low around 45. Northeast wind 6 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
A 50 percent chance of showers. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 64. East northeast wind 6 to 9 mph.
Wednesday Night
Partly cloudy, with a low around 42. East southeast wind 6 to 9 mph.
Thursday
Sunny, with a high near 80. South southeast wind 5 to 7 mph becoming east northeast in the afternoon.
Thursday Night
A 30 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 49. East northeast wind 5 to 8 mph becoming light and variable after midnight.
Friday
Mostly sunny, with a high near 76. Light and variable wind becoming north northwest 5 to 7 mph in the morning.
Friday Night
Mostly clear, with a low around 51.
Saturday
A slight chance of showers and thunderstorms after noon. Sunny, with a high near 84.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 54.
Sunday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 53.
Monday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MT
 47.07°N 109.43°W (Elev. 3898 ft)
Last Update:
2:23 pm MDT Jul 14, 2025
Forecast Valid:
4pm MDT Jul 14, 2025-6pm MDT Jul 21, 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