Severe Thunderstorms and Heavy Rainfall Across the Midwest into the Great Lakes Region; Significant Heat in the Southwest

Strong to severe storms may produce damaging winds, isolated hail, and a few tornadoes from the Midwest into the lower Great Lakes. These storms may also produce areas of heavy rain and flash flooding. Significant heat will continue across parts of the Desert Southwest into western Texas and north Alaska. Dangerous heat will also build into the Eastern and Central U.S. and continue into next week. Read More >

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

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

Clear

72°F

22°C

Humidity 37%
Wind Speed WNW 8 MPH
Barometer 29.99 in (1015.58 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 18 Jun 11:20 AM MDT
Extended Forecast for

Lewistown MTSimilar City Names

  • Today

    Today: Sunny, with a high near 79. West northwest wind 8 to 10 mph, with gusts as high as 20 mph.

    High: 79 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 49. Northwest wind 5 to 8 mph becoming southeast in the evening.

    Low: 49 °F

    Mostly Clear

  • Juneteenth

    Juneteenth: Sunny, with a high near 82. South southwest wind 5 to 8 mph becoming north northeast in the afternoon.

    High: 82 °F

    Sunny

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm.  Cloudy, with a low around 52. East wind 5 to 9 mph becoming south in the evening.  Chance of precipitation is 70%.

    Low: 52 °F

    Showers
    Likely

  • Friday

    Friday: Showers likely, mainly after noon.  Mostly cloudy, with a high near 77. East southeast wind 5 to 11 mph, with gusts as high as 23 mph.  Chance of precipitation is 60%.

    High: 77 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm before midnight, then showers likely.  Low around 49. North wind 6 to 11 mph becoming west after midnight. Winds could gust as high as 22 mph.  Chance of precipitation is 80%.

    Low: 49 °F

    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after noon.  Mostly cloudy, with a high near 68. West northwest wind 6 to 13 mph, with gusts as high as 23 mph.  Chance of precipitation is 70%.

    High: 68 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm.  Mostly cloudy, with a low around 41. West wind 11 to 14 mph, with gusts as high as 22 mph.

    Low: 41 °F

    Showers
    Likely

  • Sunday

    Sunday: A chance of showers, then showers likely and possibly a thunderstorm after noon.  Mostly cloudy, with a high near 56.

    High: 56 °F

    Showers
    Likely

Detailed Forecast

Today
Sunny, with a high near 79. West northwest wind 8 to 10 mph, with gusts as high as 20 mph.
Tonight
Mostly clear, with a low around 49. Northwest wind 5 to 8 mph becoming southeast in the evening.
Juneteenth
Sunny, with a high near 82. South southwest wind 5 to 8 mph becoming north northeast in the afternoon.
Thursday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 52. East wind 5 to 9 mph becoming south in the evening. Chance of precipitation is 70%.
Friday
Showers likely, mainly after noon. Mostly cloudy, with a high near 77. East southeast wind 5 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.
Friday Night
Showers and possibly a thunderstorm before midnight, then showers likely. Low around 49. North wind 6 to 11 mph becoming west after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 80%.
Saturday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after noon. Mostly cloudy, with a high near 68. West northwest wind 6 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.
Saturday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 41. West wind 11 to 14 mph, with gusts as high as 22 mph.
Sunday
A chance of showers, then showers likely and possibly a thunderstorm after noon. Mostly cloudy, with a high near 56.
Sunday Night
A chance of showers before midnight. Partly cloudy, with a low around 36.
Monday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 65.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 42.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 70.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MTSimilar City Names
 47.07°N 109.43°W (Elev. 3898 ft)
10:37 am MDT Jun 18, 2025
11am MDT Jun 18, 2025-6pm MDT Jun 24, 2025
 
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