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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. 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 MTSimilar City Names

  • This Afternoon

    This Afternoon: A 20 percent chance of rain before 5pm. Mostly cloudy, with a high near 83. Light and variable wind becoming south 5 to 8 mph.

    High: 83 °F

    Slight Chance
    Rain

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 55. South southeast wind 5 to 10 mph becoming light south after midnight. Winds could gust as high as 18 mph.

    Low: 55 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Saturday

    Saturday: Rain and thunderstorms likely before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Cloudy, then gradually becoming mostly sunny, with a high near 80. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 70%.

    High: 80 °F

    Chance Rain
    then Showers
    Likely

  • Saturday Night

    Saturday Night: Rain and thunderstorms likely before 4am, then a chance of showers and thunderstorms between 4am and 5am, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 48. Light and variable wind. Chance of precipitation is 60%.

    Low: 48 °F

    Showers
    Likely

  • Sunday

    Sunday: Rain and possibly a thunderstorm before noon, then showers likely and possibly a thunderstorm between noon and 3pm, then rain likely after 3pm. High near 68. West northwest wind 5 to 10 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 80%.

    High: 68 °F

    Showers

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 43. West southwest wind 16 to 21 mph decreasing to 7 to 12 mph after midnight. Winds could gust as high as 31 mph.

    Low: 43 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 78. West southwest wind 3 to 6 mph.

    High: 78 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 49. Northwest wind 6 to 8 mph becoming southeast after midnight.

    Low: 49 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of rain before 5pm. Mostly cloudy, with a high near 83. Light and variable wind becoming south 5 to 8 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 55. South southeast wind 5 to 10 mph becoming light south after midnight. Winds could gust as high as 18 mph.
Saturday
Rain and thunderstorms likely before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Cloudy, then gradually becoming mostly sunny, with a high near 80. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 70%.
Saturday Night
Rain and thunderstorms likely before 4am, then a chance of showers and thunderstorms between 4am and 5am, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 48. Light and variable wind. Chance of precipitation is 60%.
Sunday
Rain and possibly a thunderstorm before noon, then showers likely and possibly a thunderstorm between noon and 3pm, then rain likely after 3pm. High near 68. West northwest wind 5 to 10 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 80%.
Sunday Night
Mostly clear, with a low around 43. West southwest wind 16 to 21 mph decreasing to 7 to 12 mph after midnight. Winds could gust as high as 31 mph.
Monday
Sunny, with a high near 78. West southwest wind 3 to 6 mph.
Monday Night
Mostly clear, with a low around 49. Northwest wind 6 to 8 mph becoming southeast after midnight.
Tuesday
Mostly sunny, with a high near 84.
Tuesday Night
Partly cloudy, with a low around 53.
Wednesday
A slight chance of showers. Mostly sunny, with a high near 82.
Wednesday Night
A slight chance of showers. Mostly cloudy, with a low around 49.
Thursday
A slight chance of showers. Mostly sunny, with a high near 77.
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MTSimilar City Names
 47.07°N 109.43°W (Elev. 3898 ft)
Last Update:
12:31 pm MDT Aug 28, 2026
Forecast Valid:
1pm MDT Aug 28, 2026-6pm MDT Sep 3, 2026
 
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Additional Resources

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Chance of Precipitation