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

32°C

90°F

Humidity 22%
Wind Speed N 0 MPH
Barometer 29.94 in (1013.89 mb)
Dewpoint 8°C (47°F)
Visibility 16 km
Heat Index31°C (87°F)
Last update 14 Jul 03:00 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 10. North northeast wind 13 to 16 km/h, with gusts as high as 32 km/h. Chance of precipitation is 70%. New rainfall amounts between 2.5 and 5 mm possible.

    Low: 10 °C

    Chance
    T-storms then
    Showers
    Likely and
    Patchy Fog

  • Tuesday

    Tuesday: Showers, with thunderstorms also possible after 9am. Patchy fog before 8am. High near 14. Northeast wind 13 to 21 km/h, with gusts as high as 37 km/h. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 cm possible.

    High: 14 °C

    Showers and
    Patchy Fog

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Patchy fog after midnight. Low around 7. Northeast wind 10 to 18 km/h, with gusts as high as 35 km/h. Chance of precipitation is 90%. New precipitation amounts between 7.5 mm and 1 cm possible.

    Low: 7 °C

    Showers and
    Patchy Fog

  • Wednesday

    Wednesday: A 50 percent chance of showers. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 18. East northeast wind 10 to 14 km/h.

    High: 18 °C

    Chance
    Showers and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 6. East southeast wind 10 to 14 km/h.

    Low: 6 °C

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 27. South southeast wind 8 to 11 km/h becoming east northeast in the afternoon.

    High: 27 °C

    Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 9. East northeast wind 5 to 13 km/h becoming west southwest after midnight.

    Low: 9 °C

    Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 24. West wind 5 to 11 km/h becoming north northwest in the afternoon.

    High: 24 °C

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 11.

    Low: 11 °C

    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 10. North northeast wind 13 to 16 km/h, with gusts as high as 32 km/h. Chance of precipitation is 70%. New rainfall amounts between 2.5 and 5 mm possible.
Tuesday
Showers, with thunderstorms also possible after 9am. Patchy fog before 8am. High near 14. Northeast wind 13 to 21 km/h, with gusts as high as 37 km/h. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 cm possible.
Tuesday Night
Showers and possibly a thunderstorm. Patchy fog after midnight. Low around 7. Northeast wind 10 to 18 km/h, with gusts as high as 35 km/h. Chance of precipitation is 90%. New precipitation amounts between 7.5 mm and 1 cm possible.
Wednesday
A 50 percent chance of showers. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 18. East northeast wind 10 to 14 km/h.
Wednesday Night
Partly cloudy, with a low around 6. East southeast wind 10 to 14 km/h.
Thursday
Sunny, with a high near 27. South southeast wind 8 to 11 km/h becoming east northeast in the afternoon.
Thursday Night
A 30 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 9. East northeast wind 5 to 13 km/h becoming west southwest after midnight.
Friday
Mostly sunny, with a high near 24. West wind 5 to 11 km/h becoming north northwest in the afternoon.
Friday Night
Mostly clear, with a low around 11.
Saturday
A slight chance of showers and thunderstorms after noon. Sunny, with a high near 29.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 12.
Sunday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 29.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 12.
Monday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 27.
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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 m)
Last Update:
2:23 pm MDT Jul 14, 2025
Forecast Valid:
3pm MDT Jul 14, 2025-6pm MDT Jul 21, 2025
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation