Severe Thunderstorms in the Northern Plains and Upper Midwest; Critical Fire Weather in the West; Dangerous Heat in the Central and Eastern U.S.

Severe thunderstorms are likely today across the northern Plains and into the upper Mississippi Valley. Gusty winds and dry conditions will result in widespread critical fire weather through Saturday across parts of the Four Corners region and the Great Basin. A significant and dangerous heat wave will expand from the Central U.S. into the Eastern U.S this weekend through much of next week. Read More >

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

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

Overcast

55°F

13°C

Humidity 93%
Wind Speed NW 9 MPH
Barometer 29.69 in (1005.42 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 20 Jun 09:00 PM MDT
Extended Forecast for

6 Miles N Lewistown MT

  • Tonight

    Tonight: Showers and possibly a thunderstorm, mainly before 3am, then rain likely after 3am.  Low around 47. Northeast wind 6 to 11 mph becoming southwest after midnight. Winds could gust as high as 18 mph.  Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 47 °F

    Showers

  • Saturday

    Saturday: A chance of rain and thunderstorms before 11am, then a chance of rain between 11am and noon.  Mostly sunny, with a high near 65. Breezy, with a west wind 11 to 16 mph increasing to 18 to 23 mph in the afternoon. Winds could gust as high as 32 mph.  Chance of precipitation is 30%.

    High: 65 °F

    Chance
    Showers then
    Mostly Sunny
    and Breezy

  • Saturday Night

    Saturday Night: A 50 percent chance of rain after midnight.  Increasing clouds, with a low around 39. Breezy, with a west wind 19 to 24 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 33 mph.

    Low: 39 °F

    Mostly Cloudy
    and Breezy
    then Chance
    Rain

  • Sunday

    Sunday: Rain.  High near 48. Northwest wind 10 to 13 mph, with gusts as high as 23 mph.  Chance of precipitation is 90%.

    High: 48 °F

    Rain

  • Sunday Night

    Sunday Night: A 40 percent chance of showers before midnight.  Mostly cloudy, with a low around 35. Northwest wind 6 to 13 mph becoming southwest after midnight. Winds could gust as high as 22 mph.

    Low: 35 °F

    Chance
    Showers then
    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers after noon.  Mostly sunny, with a high near 65. West southwest wind around 7 mph.

    High: 65 °F

    Sunny then
    Slight Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms before midnight.  Partly cloudy, with a low around 42. West wind around 6 mph becoming light and variable  after midnight.

    Low: 42 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms after noon.  Mostly sunny, with a high near 71. Calm wind becoming north around 6 mph in the afternoon.

    High: 71 °F

    Sunny then
    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

Detailed Forecast

Tonight
Showers and possibly a thunderstorm, mainly before 3am, then rain likely after 3am. Low around 47. Northeast wind 6 to 11 mph becoming southwest after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
A chance of rain and thunderstorms before 11am, then a chance of rain between 11am and noon. Mostly sunny, with a high near 65. Breezy, with a west wind 11 to 16 mph increasing to 18 to 23 mph in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 30%.
Saturday Night
A 50 percent chance of rain after midnight. Increasing clouds, with a low around 39. Breezy, with a west wind 19 to 24 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 33 mph.
Sunday
Rain. High near 48. Northwest wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 90%.
Sunday Night
A 40 percent chance of showers before midnight. Mostly cloudy, with a low around 35. Northwest wind 6 to 13 mph becoming southwest after midnight. Winds could gust as high as 22 mph.
Monday
A 20 percent chance of showers after noon. Mostly sunny, with a high near 65. West southwest wind around 7 mph.
Monday Night
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 42. West wind around 6 mph becoming light and variable after midnight.
Tuesday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 71. Calm wind becoming north around 6 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 47.
Wednesday
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 76.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 52.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 80.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 53.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 78.
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ABOUT THIS FORECAST

 
Point Forecast:
6 Miles N Lewistown MT
 47.15°N 109.44°W (Elev. 4094 ft)
4:05 pm MDT Jun 20, 2025
9pm MDT Jun 20, 2025-6pm MDT Jun 27, 2025
 
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Additional Resources

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Hourly Weather Forecast

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