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

Heavy Rainfall and Flooding Concerns in the Southwest; Coastal Low to Impact the East Coast

Deep tropical moisture will lead to widespread showers and thunderstorms capable of producing flash flooding through early next week over the Southwest and Four Corners. A coastal storm is expected to impact the southeast U.S. coast and mid-Atlantic regions with flooding, dangerous rip currents, gusty winds and heavy rain up much of the East Coast through early next week. Read More >

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

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

Overcast

34°F

1°C

Humidity 80%
Wind Speed NW 12 MPH
Barometer 29.85 in (1010.84 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 12 Oct 11:05 AM MDT
Extended Forecast for

Lewistown MT

  • Today

    Today: A chance of rain and snow before 5pm, then a slight chance of snow. Cloudy, then gradually becoming mostly sunny, with a high near 39. Northwest wind 11 to 20 mph, with gusts as high as 28 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

    High: 39 °F

    Chance
    Rain/Snow

  • Tonight

    Tonight: Snow, mainly before 2am. Low around 23. North northwest wind 6 to 10 mph becoming east after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 23 °F

    Snow

  • Columbus Day

    Columbus Day: A 40 percent chance of snow before noon. Mostly cloudy, with a high near 38. East wind 10 to 13 mph, with gusts as high as 22 mph. Little or no snow accumulation expected.

    High: 38 °F

    Chance Snow
    then Mostly
    Cloudy

  • Monday Night

    Monday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 23. East wind 8 to 13 mph, with gusts as high as 22 mph.

    Low: 23 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Tuesday

    Tuesday: A slight chance of snow before 9am, then a slight chance of rain and snow between 9am and noon, then a slight chance of rain after noon. Partly sunny, with a high near 48. East wind 5 to 7 mph. Chance of precipitation is 20%.

    High: 48 °F

    Slight Chance
    Rain/Snow
    then Slight
    Chance Rain

  • Tuesday Night

    Tuesday Night: A 40 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 30. East wind around 6 mph becoming calm after midnight.

    Low: 30 °F

    Chance Rain

  • Wednesday

    Wednesday: Rain likely. Mostly cloudy, with a high near 45. Calm wind becoming west northwest around 6 mph in the afternoon. Chance of precipitation is 70%.

    High: 45 °F

    Rain Likely

  • Wednesday Night

    Wednesday Night: Rain likely. Mostly cloudy, with a low around 31. West wind 6 to 8 mph.

    Low: 31 °F

    Rain Likely

  • Thursday

    Thursday: Rain likely. Mostly cloudy, with a high near 47.

    High: 47 °F

    Rain Likely

Detailed Forecast

Today
A chance of rain and snow before 5pm, then a slight chance of snow. Cloudy, then gradually becoming mostly sunny, with a high near 39. Northwest wind 11 to 20 mph, with gusts as high as 28 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Tonight
Snow, mainly before 2am. Low around 23. North northwest wind 6 to 10 mph becoming east after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Columbus Day
A 40 percent chance of snow before noon. Mostly cloudy, with a high near 38. East wind 10 to 13 mph, with gusts as high as 22 mph. Little or no snow accumulation expected.
Monday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 23. East wind 8 to 13 mph, with gusts as high as 22 mph.
Tuesday
A slight chance of snow before 9am, then a slight chance of rain and snow between 9am and noon, then a slight chance of rain after noon. Partly sunny, with a high near 48. East wind 5 to 7 mph. Chance of precipitation is 20%.
Tuesday Night
A 40 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 30. East wind around 6 mph becoming calm after midnight.
Wednesday
Rain likely. Mostly cloudy, with a high near 45. Calm wind becoming west northwest around 6 mph in the afternoon. Chance of precipitation is 70%.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 31. West wind 6 to 8 mph.
Thursday
Rain likely. Mostly cloudy, with a high near 47.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 31.
Friday
A chance of rain. Partly sunny, with a high near 53.
Friday Night
A chance of rain. Mostly cloudy, with a low around 28.
Saturday
A chance of rain and snow. Partly sunny, with a high near 48.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MT
 47.07°N 109.43°W (Elev. 3898 ft)
Last Update:
4:33 am MDT Oct 12, 2025
Forecast Valid:
11am MDT Oct 12, 2025-6pm MDT Oct 18, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation