Severe Thunderstorms and Heavy Rain Across the Ohio Valley;

Severe thunderstorms with damaging wind gusts will be possible from the mid-Mississippi Valley into parts of the Ohio Valley and central Appalachians. Heavy rain associated with these storms may lead to considerable flash and urban flooding impacts across portions of the Ohio Valley. Mid-summer heat persists from the Central Plains to the Southeast. Read More >

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

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

Clear

N/A

Humidity 59%
Wind Speed N 0 MPH
Barometer NA
Dewpoint N/A
Visibility 10.00 mi
Last update 30 Jul 04:50 AM MDT
Extended Forecast for

Lewistown Municipal MT

  • Tonight

    Tonight: Patchy smoke. Mostly clear, with a low around 51. North wind 5 to 7 mph becoming south after midnight.

    Low: 51 °F

    Patchy Smoke

  • Wednesday

    Wednesday: Patchy smoke. Mostly sunny, with a high near 77. South southwest wind 5 to 10 mph becoming north northeast in the afternoon.

    High: 77 °F

    Patchy Smoke

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms before 3am, then showers and possibly a thunderstorm, mainly after 3am.  Patchy smoke before 9pm. Low around 49. East wind 8 to 11 mph, with gusts as high as 21 mph.  Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 49 °F

    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm.  High near 66. East wind around 9 mph, with gusts as high as 18 mph.  Chance of precipitation is 80%.

    High: 66 °F

    Showers

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm.  Low around 47. East wind 5 to 8 mph becoming light and variable  after midnight.  Chance of precipitation is 90%.

    Low: 47 °F

    Showers

  • Friday

    Friday: Showers, with thunderstorms also possible after noon.  High near 66. West northwest wind around 7 mph.  Chance of precipitation is 80%.

    High: 66 °F

    Showers then
    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms.  Mostly cloudy, with a low around 45. North wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 50%.

    Low: 45 °F

    Chance
    Showers

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after noon.  Partly sunny, with a high near 72. Calm wind.

    High: 72 °F

    Chance
    Showers

  • Saturday Night

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

    Low: 47 °F

    Chance
    T-storms then
    Slight Chance
    Showers

Detailed Forecast

Tonight
Patchy smoke. Mostly clear, with a low around 51. North wind 5 to 7 mph becoming south after midnight.
Wednesday
Patchy smoke. Mostly sunny, with a high near 77. South southwest wind 5 to 10 mph becoming north northeast in the afternoon.
Wednesday Night
Showers and thunderstorms before 3am, then showers and possibly a thunderstorm, mainly after 3am. Patchy smoke before 9pm. Low around 49. East wind 8 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
Showers and possibly a thunderstorm. High near 66. East wind around 9 mph, with gusts as high as 18 mph. Chance of precipitation is 80%.
Thursday Night
Showers and possibly a thunderstorm. Low around 47. East wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 90%.
Friday
Showers, with thunderstorms also possible after noon. High near 66. West northwest wind around 7 mph. Chance of precipitation is 80%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 45. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.
Saturday
A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 72. Calm wind.
Saturday Night
A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 47.
Sunday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 79.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 50.
Monday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 82.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 51.
Tuesday
A slight chance of showers. Mostly sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown Municipal MT
 47.04°N 109.45°W (Elev. 4111 ft)
4:12 pm MDT Aug 11, 2026
6pm MDT Aug 11, 2026-6pm MDT Aug 18, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database