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

N/A

Humidity 80%
Wind Speed SE 4 MPH
Barometer NA
Dewpoint N/A
Visibility 10.00 mi
Last update 05 Apr 02:15 AM MDT
Extended Forecast for

Lewistown Municipal MT

  • Tonight

    Tonight: A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 38. West southwest wind 8 to 10 mph.

    Low: 38 °F

    Chance
    Showers then
    Partly Cloudy

  • Sunday

    Sunday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5pm. Increasing clouds, with a high near 59. West southwest wind 6 to 8 mph becoming east northeast in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 59 °F

    Mostly Sunny
    then Showers
    Likely

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm before midnight, then rain likely after midnight. Low around 36. East wind around 7 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 36 °F

    Showers then
    Rain Likely

  • Monday

    Monday: Rain, mainly between noon and 3pm, then showers and possibly a thunderstorm after 3pm. High near 52. Southwest wind 6 to 10 mph becoming west northwest in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 90%.

    High: 52 °F

    Chance Rain
    then Showers

  • Monday Night

    Monday Night: A 50 percent chance of rain before midnight. Mostly cloudy, with a low around 35. West southwest wind 7 to 9 mph.

    Low: 35 °F

    Chance Rain
    then Mostly
    Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 58. West wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 58 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35. West wind 5 to 14 mph, with gusts as high as 22 mph.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of rain, mainly after noon. Mostly cloudy, with a high near 52. West wind 8 to 16 mph, with gusts as high as 28 mph.

    High: 52 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: Rain likely before 9pm, then rain and snow likely between 9pm and 3am, then snow likely after 3am. Mostly cloudy, with a low around 25.

    Low: 25 °F

    Rain/Snow
    Likely

Detailed Forecast

Tonight
A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 38. West southwest wind 8 to 10 mph.
Sunday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5pm. Increasing clouds, with a high near 59. West southwest wind 6 to 8 mph becoming east northeast in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Showers and possibly a thunderstorm before midnight, then rain likely after midnight. Low around 36. East wind around 7 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
Rain, mainly between noon and 3pm, then showers and possibly a thunderstorm after 3pm. High near 52. Southwest wind 6 to 10 mph becoming west northwest in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 90%.
Monday Night
A 50 percent chance of rain before midnight. Mostly cloudy, with a low around 35. West southwest wind 7 to 9 mph.
Tuesday
Mostly sunny, with a high near 58. West wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 35. West wind 5 to 14 mph, with gusts as high as 22 mph.
Wednesday
A chance of rain, mainly after noon. Mostly cloudy, with a high near 52. West wind 8 to 16 mph, with gusts as high as 28 mph.
Wednesday Night
Rain likely before 9pm, then rain and snow likely between 9pm and 3am, then snow likely after 3am. Mostly cloudy, with a low around 25.
Thursday
Snow likely. Mostly cloudy, with a high near 37.
Thursday Night
A chance of snow. Mostly cloudy, with a low around 17.
Friday
A chance of snow. Partly sunny, with a high near 38.
Friday Night
A slight chance of snow. Mostly cloudy, with a low around 20.
Saturday
A slight chance of rain and snow. Mostly sunny, with a high near 48.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown Municipal MT
 47.04°N 109.45°W (Elev. 4111 ft)
Last Update:
9:32 pm MDT Apr 11, 2026
Forecast Valid:
10pm MDT Apr 11, 2026-6pm MDT Apr 18, 2026
 
Forecast Discussion
 
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Additional Resources

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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