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Areas of Severe Thunderstorms and Heat

Scattered severe thunderstorms and excessive rainfall are possible today in the Mid Atlantic, posing a risk for damaging winds and isolated flash flooding. Extreme Heat Warnings are in effect today for northeast Texas into southern Oklahoma and Arkansas. Extreme Heat Warnings are also in effect for the Desert Southwest today into Sunday. Read More >

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

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

Clear

N/A

Humidity 59%
Wind Speed N 0 MPH
Barometer NA
Dewpoint N/A
Visibility 10.00 mi
Last update 30 Jul 04:50 AM MDT
Extended Forecast for

Lewistown Municipal MT

  • Tonight

    Tonight: Partly cloudy, with a low around 55. North northwest wind around 6 mph becoming calm after midnight.

    Low: 55 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 85. Light and variable wind becoming north northeast 6 to 11 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 85 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 57. East southeast wind 10 to 14 mph, with gusts as high as 22 mph.

    Low: 57 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Cloudy, then gradually becoming mostly sunny, with a high near 88. Southeast wind around 8 mph, with gusts as high as 18 mph.

    High: 88 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, with a low around 58. South wind 5 to 8 mph. Chance of precipitation is 20%.

    Low: 58 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 88. Light and variable wind becoming west 5 to 9 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 88 °F

    Mostly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A 20 percent chance of showers before midnight. Partly cloudy, with a low around 53. West southwest wind 5 to 8 mph.

    Low: 53 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 80. Light and variable wind becoming north northwest 5 to 9 mph in the afternoon. Winds could gust as high as 18 mph.

    High: 80 °F

    Sunny

  • Monday Night

    Monday Night: A slight chance of showers after midnight. Partly cloudy, with a low around 50.

    Low: 50 °F

    Mostly Clear
    then Slight
    Chance
    Showers

Detailed Forecast

Tonight
Partly cloudy, with a low around 55. North northwest wind around 6 mph becoming calm after midnight.
Friday
Sunny, with a high near 85. Light and variable wind becoming north northeast 6 to 11 mph in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Increasing clouds, with a low around 57. East southeast wind 10 to 14 mph, with gusts as high as 22 mph.
Saturday
Cloudy, then gradually becoming mostly sunny, with a high near 88. Southeast wind around 8 mph, with gusts as high as 18 mph.
Saturday Night
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, with a low around 58. South wind 5 to 8 mph. Chance of precipitation is 20%.
Sunday
A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 88. Light and variable wind becoming west 5 to 9 mph in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
A 20 percent chance of showers before midnight. Partly cloudy, with a low around 53. West southwest wind 5 to 8 mph.
Monday
Sunny, with a high near 80. Light and variable wind becoming north northwest 5 to 9 mph in the afternoon. Winds could gust as high as 18 mph.
Monday Night
A slight chance of showers after midnight. Partly cloudy, with a low around 50.
Tuesday
Mostly sunny, with a high near 81.
Tuesday Night
Partly cloudy, with a low around 53.
Wednesday
Mostly sunny, with a high near 84.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 52.
Thursday
Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown Municipal MT
 47.04°N 109.45°W (Elev. 4111 ft)
Last Update:
5:06 pm MDT Aug 20, 2026
Forecast Valid:
5pm MDT Aug 20, 2026-6pm MDT Aug 27, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation