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

Heavy Rainfall for Portions of the West and Central U.S.; Monitoring Fire Weather Conditions for New England

Tropical moisture continues to flow across portions of the Great Basin, desert Southwest and California. Isolated instances of flash flooding remains possible. Meanwhile, a storm and associated frontal boundary will focus showers and thunderstorms for the center of the nation. For New England, dry and breezy conditions could enhance favorable fire weather conditions. 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 21%
Wind Speed SW 10 MPH
Barometer 29.95 in (1014.22 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 20 Sep 02:20 PM MDT
Extended Forecast for

Lewistown MTSimilar City Names

  • This Afternoon

    This Afternoon: Sunny, with a high near 83. West northwest wind around 6 mph.

    High: 83 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 50. Light and variable wind becoming south 5 to 7 mph in the evening.

    Low: 50 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 82. South wind 6 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph.

    High: 82 °F

    Sunny

  • Sunday Night

    Sunday Night: Rain. Low around 47. West northwest wind 9 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 90%.

    Low: 47 °F

    Rain

  • Monday

    Monday: A 40 percent chance of rain, mainly before noon. Partly sunny, with a high near 62. Northwest wind 14 to 18 mph, with gusts as high as 29 mph.

    High: 62 °F

    Chance Rain

  • 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 18 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 47. Light southeast wind becoming south 5 to 9 mph in the evening.

    Low: 47 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 83.

    High: 83 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 83. West northwest wind around 6 mph.
Tonight
Partly cloudy, with a low around 50. Light and variable wind becoming south 5 to 7 mph in the evening.
Sunday
Sunny, with a high near 82. South wind 6 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph.
Sunday Night
Rain. Low around 47. West northwest wind 9 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 90%.
Monday
A 40 percent chance of rain, mainly before noon. Partly sunny, with a high near 62. Northwest wind 14 to 18 mph, with gusts as high as 29 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 18 mph.
Tuesday
Sunny, with a high near 75. South wind around 6 mph.
Tuesday Night
Clear, with a low around 47. Light southeast wind becoming south 5 to 9 mph in the evening.
Wednesday
Sunny, with a high near 83.
Wednesday Night
Mostly clear, with a low around 49.
Thursday
Sunny, with a high near 78.
Thursday Night
Mostly clear, with a low around 47.
Friday
Sunny, with a high near 80.
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MTSimilar City Names
 47.07°N 109.43°W (Elev. 3898 ft)
Last Update:
2:10 pm MDT Sep 20, 2025
Forecast Valid:
2pm MDT Sep 20, 2025-6pm MDT Sep 26, 2025
 
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