National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Areas of Excessive Rainfall; Watching for Tropical Cyclone Development in the Atlantic

Heavy to excessive rainfall Wednesday may bring areas of flash and urban flooding over portions of the Ohio and Tennessee Valleys. In Arizona and New Mexico, heavy to excessive rainfall from monsoon thunderstorms may bring isolated flash and urban flooding Thursday into Saturday. Two tropical waves in the Atlantic are being monitored for tropical cyclone formation within the next few days. Read More >

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

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

Clear

46°F

8°C

Humidity 65%
Wind Speed ESE 6 MPH
Barometer 30.2 in (1022.69 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 24 Sep 01:20 AM MDT
Extended Forecast for

Lewistown MTSimilar City Names

  • Overnight

    Overnight: Mostly clear, with a low around 46. Southeast wind 7 to 9 mph.

    Low: 46 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 84. Southeast wind 5 to 7 mph becoming light and variable in the afternoon.

    High: 84 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 46. Calm wind becoming south southwest 5 to 7 mph.

    Low: 46 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 84. Calm wind becoming south southwest 5 to 7 mph in the afternoon.

    High: 84 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 50. South southwest wind 8 to 10 mph.

    Low: 50 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 74. West wind 8 to 13 mph, with gusts as high as 22 mph.

    High: 74 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 46. North northwest wind 6 to 10 mph becoming south after midnight. Winds could gust as high as 20 mph.

    Low: 46 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 81. South wind 6 to 8 mph becoming west in the afternoon.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 50.

    Low: 50 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 46. Southeast wind 7 to 9 mph.
Wednesday
Sunny, with a high near 84. Southeast wind 5 to 7 mph becoming light and variable in the afternoon.
Wednesday Night
Mostly clear, with a low around 46. Calm wind becoming south southwest 5 to 7 mph.
Thursday
Sunny, with a high near 84. Calm wind becoming south southwest 5 to 7 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 50. South southwest wind 8 to 10 mph.
Friday
Sunny, with a high near 74. West wind 8 to 13 mph, with gusts as high as 22 mph.
Friday Night
Mostly clear, with a low around 46. North northwest wind 6 to 10 mph becoming south after midnight. Winds could gust as high as 20 mph.
Saturday
Sunny, with a high near 81. South wind 6 to 8 mph becoming west in the afternoon.
Saturday Night
Mostly clear, with a low around 50.
Sunday
Sunny, with a high near 82.
Sunday Night
Partly cloudy, with a low around 51.
Monday
A slight chance of rain. Mostly sunny, with a high near 80.
Monday Night
A chance of rain. Mostly cloudy, with a low around 48.
Tuesday
A slight chance of rain. Mostly sunny, with a high near 72.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MTSimilar City Names
 47.07°N 109.43°W (Elev. 3898 ft)
Last Update:
10:23 pm MDT Sep 23, 2025
Forecast Valid:
1am MDT Sep 24, 2025-6pm MDT Sep 30, 2025
 
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