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 MT

  • Tonight

    Tonight: Patchy smoke. Mostly clear, with a low around 52. North wind 5 to 7 mph becoming south after midnight.

    Low: 52 °F

    Patchy Smoke

  • Wednesday

    Wednesday: Patchy smoke. Mostly sunny, with a high near 78. South wind 5 to 10 mph becoming north in the afternoon.

    High: 78 °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 50. East wind 8 to 11 mph, with gusts as high as 20 mph.  Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 50 °F

    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm.  High near 67. East wind 7 to 9 mph, with gusts as high as 18 mph.  Chance of precipitation is 80%.

    High: 67 °F

    Showers

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm.  Low around 48. East wind 5 to 8 mph becoming calm  after midnight.  Chance of precipitation is 90%.

    Low: 48 °F

    Showers

  • Friday

    Friday: Showers, with thunderstorms also possible after noon.  High near 67. West northwest wind around 6 mph.  Chance of precipitation is 80%.

    High: 67 °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 slight chance of showers, then a chance of showers and thunderstorms after noon.  Partly sunny, with a high near 73. Calm wind.

    High: 73 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before midnight.  Mostly cloudy, with a low around 48.

    Low: 48 °F

    Chance
    T-storms then
    Mostly Cloudy

Detailed Forecast

Tonight
Patchy smoke. Mostly clear, with a low around 52. North wind 5 to 7 mph becoming south after midnight.
Wednesday
Patchy smoke. Mostly sunny, with a high near 78. South wind 5 to 10 mph becoming north 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 50. East wind 8 to 11 mph, with gusts as high as 20 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 67. East wind 7 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 80%.
Thursday Night
Showers and possibly a thunderstorm. Low around 48. East wind 5 to 8 mph becoming calm after midnight. Chance of precipitation is 90%.
Friday
Showers, with thunderstorms also possible after noon. High near 67. West northwest wind around 6 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 slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 73. Calm wind.
Saturday Night
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 48.
Sunday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 80.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 51.
Monday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 83.
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 80.
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MT
 47.07°N 109.43°W (Elev. 3898 ft)
4:12 pm MDT Aug 11, 2026
5pm MDT Aug 11, 2026-6pm MDT Aug 18, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database