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

Heavy Rainfall Threat Continues in the Southwest on Monday; Record Warmth in the Plains and Midwest

Remnant moisture from Tropical Storm Rachel will persist over portions of the Great Basin and Southwest on Monday, bringing a potential heavy to excessive rainfall risk. Well above average and potentially record breaking temperatures will develop across the Plains and Midwest early this week, spreading into the Lower Mississippi Valley and Southeast midweek. Read More >

Hazardous Weather Conditions

Current conditions at

Lewistown Divide MT-200 MP 90.3 (MTLEW)

Lat: 47.07579°NLon: 109.26247°WElev: 4723.0ft.

NA

26°F

-3°C

Humidity 99%
Wind Speed ESE 3 MPH
Barometer NA
Dewpoint 26°F (-3°C)
Visibility NA
Last update 12 Oct 11:30 PM MDT
Extended Forecast for

Lewistown MTSimilar City Names

Dense Fog Advisory until October 13, 12:00pm
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until October 13, 12:00pm

    NOW until 12:00pm Tue

    Dense Fog Advisory

  • Tonight

    Low: 23 °F

    Patchy Dense
    Fog

  • Tuesday

    Tuesday: Sunny, with a high near 41. South wind 5 to 8 mph becoming west in the afternoon.

    High: 41 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 21. West southwest wind 5 to 9 mph becoming calm after midnight.

    Low: 21 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 48. Light and variable wind.

    High: 48 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 32. West wind 3 to 6 mph.

    Low: 32 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 54. Light west northwest wind.

    High: 54 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 31. Calm wind becoming southeast 5 to 8 mph in the evening.

    Low: 31 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 70. South wind around 9 mph, with gusts as high as 20 mph.

    High: 70 °F

    Sunny

Detailed Forecast

Tonight
Patchy dense fog. Otherwise, mostly cloudy, with a steady temperature around 23. Southeast wind around 6 mph.
Tuesday
Sunny, with a high near 41. South wind 5 to 8 mph becoming west in the afternoon.
Tuesday Night
Mostly clear, with a low around 21. West southwest wind 5 to 9 mph becoming calm after midnight.
Wednesday
Sunny, with a high near 48. Light and variable wind.
Wednesday Night
Partly cloudy, with a low around 32. West wind 3 to 6 mph.
Thursday
Sunny, with a high near 54. Light west northwest wind.
Thursday Night
Mostly clear, with a low around 31. Calm wind becoming southeast 5 to 8 mph in the evening.
Friday
Sunny, with a high near 70. South wind around 9 mph, with gusts as high as 20 mph.
Friday Night
Mostly clear, with a low around 43.
Saturday
Sunny, with a high near 74.
Saturday Night
Partly cloudy, with a low around 41.
Sunday
Sunny, with a high near 68.
Sunday Night
Mostly clear, with a low around 40.
Monday
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:
10:41 pm MDT Oct 12, 2026
Forecast Valid:
11pm MDT Oct 12, 2026-6pm MDT Oct 19, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation