Showers and Thunderstorms from the Great Lakes into the Southern Plains

Frontal boundary and wave of low pressure will keep an active weather pattern from the Great Lakes region through the southern Plains the next couple of days. Isolated instances of severe thunderstorms and flash flooding are possible. Meanwhile, as summer comes to a close, above normal temperatures continue for central and eastern U.S. - especially for most of Puerto Rico with excessive heat. Read More >

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

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

Clear

81°F

27°C

Humidity 19%
Wind Speed WNW 5 MPH
Barometer 29.84 in (1010.5 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 21 Sep 12:00 PM MDT
Extended Forecast for

Lewistown MTSimilar City Names

  • This Afternoon

    This Afternoon: Sunny, with a high near 82. Northwest wind 7 to 9 mph.

    High: 82 °F

    Sunny

  • Tonight

    Tonight: Showers, mainly before 3am.  Low around 46. West wind 8 to 13 mph, with gusts as high as 23 mph.  Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 46 °F

    Showers

  • Monday

    Monday: A 40 percent chance of showers before noon.  Cloudy, then gradually becoming mostly sunny, with a high near 62. Northwest wind 13 to 18 mph, with gusts as high as 25 mph.

    High: 62 °F

    Chance
    Showers then
    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 39. Northwest wind 6 to 9 mph becoming south after midnight. Winds could gust as high as 20 mph.

    Low: 39 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 75. South wind around 6 mph.

    High: 75 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 46. Light south wind increasing to 5 to 9 mph in the evening.

    Low: 46 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 83. Southwest wind around 8 mph.

    High: 83 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 48. South southwest wind 5 to 8 mph.

    Low: 48 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 82. Northwest wind 7 to 9 mph.
Tonight
Showers, mainly before 3am. Low around 46. West wind 8 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
A 40 percent chance of showers before noon. Cloudy, then gradually becoming mostly sunny, with a high near 62. Northwest wind 13 to 18 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 39. Northwest wind 6 to 9 mph becoming south after midnight. Winds could gust as high as 20 mph.
Tuesday
Sunny, with a high near 75. South wind around 6 mph.
Tuesday Night
Clear, with a low around 46. Light south wind increasing to 5 to 9 mph in the evening.
Wednesday
Sunny, with a high near 83. Southwest wind around 8 mph.
Wednesday Night
Mostly clear, with a low around 48. South southwest wind 5 to 8 mph.
Thursday
Sunny, with a high near 81.
Thursday Night
Mostly clear, with a low around 50.
Friday
Sunny, with a high near 81.
Friday Night
Mostly clear, with a low around 49.
Saturday
Sunny, with a high near 78.
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MTSimilar City Names
 47.07°N 109.43°W (Elev. 3898 ft)
5:55 am MDT Sep 21, 2025
12pm MDT Sep 21, 2025-6pm MDT Sep 27, 2025
 
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