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.

Rain

72°F

22°C

Humidity 40%
Wind Speed WNW 20 MPH
Barometer 29.96 in (1014.56 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Last update 04 Aug 09:54 PM MDT
Extended Forecast for

Lewistown MT

  • Tonight

    Tonight: Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms after midnight. Some of the storms could be severe. Mostly cloudy, with a low around 53. West wind around 6 mph becoming south after midnight. Chance of precipitation is 60%.

    Low: 53 °F

    Severe
    Thunderstorms

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms, mainly between 3pm and 4pm. Mostly sunny, with a high near 75. South southwest wind 5 to 10 mph becoming west northwest 11 to 16 mph in the afternoon. Winds could gust as high as 23 mph.

    High: 75 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 49. West northwest wind 5 to 15 mph becoming south after midnight. Winds could gust as high as 21 mph.

    Low: 49 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 83. Light and variable wind becoming west around 6 mph in the afternoon.

    High: 83 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 52. Northwest wind 5 to 7 mph becoming calm after midnight.

    Low: 52 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 78. Calm wind becoming north northwest 5 to 8 mph in the afternoon.

    High: 78 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 48. Southwest wind 6 to 8 mph. Chance of precipitation is 60%.

    Low: 48 °F

    Showers
    Likely then
    Chance
    T-storms

  • Friday

    Friday: A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 69. West northwest wind 6 to 16 mph, with gusts as high as 26 mph.

    High: 69 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 48.

    Low: 48 °F

    Slight Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Tonight
Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms after midnight. Some of the storms could be severe. Mostly cloudy, with a low around 53. West wind around 6 mph becoming south after midnight. Chance of precipitation is 60%.
Tuesday
A 40 percent chance of showers and thunderstorms, mainly between 3pm and 4pm. Mostly sunny, with a high near 75. South southwest wind 5 to 10 mph becoming west northwest 11 to 16 mph in the afternoon. Winds could gust as high as 23 mph.
Tuesday Night
Mostly clear, with a low around 49. West northwest wind 5 to 15 mph becoming south after midnight. Winds could gust as high as 21 mph.
Wednesday
Sunny, with a high near 83. Light and variable wind becoming west around 6 mph in the afternoon.
Wednesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 52. Northwest wind 5 to 7 mph becoming calm after midnight.
Thursday
A 40 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 78. Calm wind becoming north northwest 5 to 8 mph in the afternoon.
Thursday Night
Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 48. Southwest wind 6 to 8 mph. Chance of precipitation is 60%.
Friday
A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 69. West northwest wind 6 to 16 mph, with gusts as high as 26 mph.
Friday Night
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 48.
Saturday
Mostly sunny, with a high near 75.
Saturday Night
Partly cloudy, with a low around 51.
Sunday
Mostly sunny, with a high near 76.
Sunday Night
Partly cloudy, with a low around 51.
Monday
Mostly sunny, with a high near 75.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MT
 47.09°N 109.46°W (Elev. 3898 ft)
Last Update:
9:41 pm MDT Aug 4, 2025
Forecast Valid:
10pm MDT Aug 4, 2025-6pm MDT Aug 11, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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