Heavy to Excessive Rainfall and Flooding Threats in the Central and Eastern U.S.; Heat and Fire Weather Concerns in the West

Thunderstorms producing excessive rainfall and potential flooding concerns will continue through tonight from the Southern Plains to the East Coast. Areas of greatest concern for flooding are over central Texas and the Mid-Atlantic. Heat will continue to build across the West through Tuesday. Heat Advisories and Extreme Heat Warnings are in effect. Fire Weather concerns continue through Monday. Read More >

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

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

Clear

66°F

19°C

Humidity 48%
Wind Speed ESE 9 MPH
Barometer 30.07 in (1018.29 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 14 Jul 12:05 AM MDT
Extended Forecast for

Lewistown MT

  • Overnight

    Overnight: Mostly clear, with a low around 58. Southeast wind around 6 mph.

    Low: 58 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 4pm.  Sunny, with a high near 90. South wind 5 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph.

    High: 90 °F

    Sunny then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm.  Cloudy, with a low around 50. Northwest wind 9 to 11 mph becoming north northeast in the evening. Winds could gust as high as 21 mph.  Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 50 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers, with thunderstorms also possible after noon.  High near 58. Northeast wind 9 to 13 mph, with gusts as high as 23 mph.  Chance of precipitation is 80%.

    High: 58 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 3am, then showers likely.  Low around 45. East northeast wind 6 to 11 mph, with gusts as high as 21 mph.  Chance of precipitation is 80%.

    Low: 45 °F

    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after noon.  Mostly cloudy, with a high near 61. East wind 6 to 8 mph.  Chance of precipitation is 50%.

    High: 61 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43. East wind 6 to 8 mph.

    Low: 43 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 74. Light and variable wind becoming north 5 to 7 mph in the afternoon.

    High: 74 °F

    Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms before midnight.  Partly cloudy, with a low around 48.

    Low: 48 °F

    Slight Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 58. Southeast wind around 6 mph.
Monday
A 20 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 90. South wind 5 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph.
Monday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 50. Northwest wind 9 to 11 mph becoming north northeast in the evening. Winds could gust as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
Showers, with thunderstorms also possible after noon. High near 58. Northeast wind 9 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.
Tuesday Night
Showers and possibly a thunderstorm before 3am, then showers likely. Low around 45. East northeast wind 6 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 80%.
Wednesday
A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 61. East wind 6 to 8 mph. Chance of precipitation is 50%.
Wednesday Night
Partly cloudy, with a low around 43. East wind 6 to 8 mph.
Thursday
Sunny, with a high near 74. Light and variable wind becoming north 5 to 7 mph in the afternoon.
Thursday Night
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 48.
Friday
Mostly sunny, with a high near 78.
Friday Night
Mostly clear, with a low around 52.
Saturday
Sunny, with a high near 83.
Saturday Night
Partly cloudy, with a low around 54.
Sunday
A slight chance of showers and thunderstorms. Sunny, with a high near 86.
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MT
 47.07°N 109.43°W (Elev. 3898 ft)
9:57 pm MDT Jul 13, 2025
12am MDT Jul 14, 2025-6pm MDT Jul 20, 2025
 
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Additional Resources

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Hourly Weather Forecast

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