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

Atmospheric River Continues Areas of Heavy Rain and Snow for California This Weekend

An atmospheric river will continue to bring gusty winds, moderate to heavy rainfall, and potential flooding to southern California and the southern Great Basin through Sunday. Periods of heavy snow will continue as well above 7,000 feet over the Sierra Nevada mountains associated with this atmospheric river. Read More >

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

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

Clear

54°F

12°C

Humidity 46%
Wind Speed WNW 10 MPH
Barometer 29.9 in (1012.53 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 15 Nov 04:35 PM MST
Extended Forecast for

Lewistown MTSimilar City Names

  • Tonight

    Tonight: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 33. West wind 5 to 10 mph becoming light and variable. Winds could gust as high as 21 mph.

    Low: 33 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 8am. Otherwise, partly sunny, with a high near 60. East southeast wind around 6 mph.

    High: 60 °F

    Patchy Fog
    then Partly
    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 37. South southeast wind 5 to 7 mph.

    Low: 37 °F

    Mostly Cloudy

  • Monday

    Monday: A 30 percent chance of rain, mainly after 11am. Mostly cloudy, with a high near 54. Calm wind becoming west northwest around 6 mph in the afternoon.

    High: 54 °F

    Chance Rain

  • Monday Night

    Monday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 33. West wind around 6 mph.

    Low: 33 °F

    Chance Rain

  • Tuesday

    Tuesday: A 40 percent chance of rain. Partly sunny, with a high near 50. West wind 3 to 6 mph.

    High: 50 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: A chance of rain before 11pm, then a chance of rain and snow. Mostly cloudy, with a low around 29. Light and variable wind becoming south southwest around 5 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

    Low: 29 °F

    Chance
    Rain/Snow

  • Wednesday

    Wednesday: A chance of rain and snow. Mostly cloudy, with a high near 42. Northwest wind around 6 mph.

    High: 42 °F

    Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: A slight chance of rain and snow before 11pm. Mostly cloudy, with a low around 23.

    Low: 23 °F

    Slight Chance
    Rain/Snow
    then Mostly
    Cloudy

Detailed Forecast

Tonight
Patchy fog after 5am. Otherwise, partly cloudy, with a low around 33. West wind 5 to 10 mph becoming light and variable. Winds could gust as high as 21 mph.
Sunday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 60. East southeast wind around 6 mph.
Sunday Night
Mostly cloudy, with a low around 37. South southeast wind 5 to 7 mph.
Monday
A 30 percent chance of rain, mainly after 11am. Mostly cloudy, with a high near 54. Calm wind becoming west northwest around 6 mph in the afternoon.
Monday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 33. West wind around 6 mph.
Tuesday
A 40 percent chance of rain. Partly sunny, with a high near 50. West wind 3 to 6 mph.
Tuesday Night
A chance of rain before 11pm, then a chance of rain and snow. Mostly cloudy, with a low around 29. Light and variable wind becoming south southwest around 5 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Wednesday
A chance of rain and snow. Mostly cloudy, with a high near 42. Northwest wind around 6 mph.
Wednesday Night
A slight chance of rain and snow before 11pm. Mostly cloudy, with a low around 23.
Thursday
Mostly sunny, with a high near 45.
Thursday Night
Partly cloudy, with a low around 24.
Friday
Mostly sunny, with a high near 46.
Friday Night
Partly cloudy, with a low around 26.
Saturday
A slight chance of rain and snow. Mostly sunny, with a high near 47.
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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:
2:18 pm MST Nov 15, 2025
Forecast Valid:
4pm MST Nov 15, 2025-6pm MST Nov 22, 2025
 
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Additional Resources

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Chance of Precipitation