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

Prolonged, Intense Heat Wave; Excessive Rainfall in the Southern Rockies and Central Plains into the Upper Midwest

Extremely dangerous heat persists through Thursday with widespread daily temperature records. Monsoonal moisture continues to bring heavy rain and flash flooding to New Mexico and west Texas through Thursday, especially in the burn scar areas. Thunderstorms and heavy to excessive rain will continue to bring a flash flood threat from the Central Plains into the Upper Midwest. Read More >

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

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

Clear

46°F

8°C

Humidity 93%
Wind Speed SE 5 MPH
Barometer 30.04 in (1017.27 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 25 Jun 04:30 AM MDT
Extended Forecast for

Lewistown MT

  • Today

    Today: A 20 percent chance of showers and thunderstorms after 5pm. Sunny, with a high near 80. Southeast wind around 5 mph becoming calm in the morning.

    High: 80 °F

    Sunny then
    Slight Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 11pm. Partly cloudy, with a low around 52. Light and variable wind becoming east southeast around 6 mph in the evening. Chance of precipitation is 20%.

    Low: 52 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 80. Light and variable wind becoming west northwest around 6 mph in the morning.

    High: 80 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 51. West southwest wind around 6 mph becoming calm after midnight.

    Low: 51 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 75. Calm wind becoming west northwest 5 to 8 mph in the morning.

    High: 75 °F

    Partly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 51. West southwest wind 3 to 7 mph. Chance of precipitation is 30%.

    Low: 51 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 75. Light and variable wind becoming west northwest 5 to 10 mph in the morning. Winds could gust as high as 21 mph.

    High: 75 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 49. Northwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 18 mph.

    Low: 49 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after 5pm. Sunny, with a high near 80. Southeast wind around 5 mph becoming calm in the morning.
Tonight
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 11pm. Partly cloudy, with a low around 52. Light and variable wind becoming east southeast around 6 mph in the evening. Chance of precipitation is 20%.
Thursday
A 30 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 80. Light and variable wind becoming west northwest around 6 mph in the morning.
Thursday Night
A 40 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 51. West southwest wind around 6 mph becoming calm after midnight.
Friday
A 30 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 75. Calm wind becoming west northwest 5 to 8 mph in the morning.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 51. West southwest wind 3 to 7 mph. Chance of precipitation is 30%.
Saturday
Mostly sunny, with a high near 75. Light and variable wind becoming west northwest 5 to 10 mph in the morning. Winds could gust as high as 21 mph.
Saturday Night
Partly cloudy, with a low around 49. Northwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 18 mph.
Sunday
Sunny, with a high near 76.
Sunday Night
Mostly clear, with a low around 51.
Monday
Sunny, with a high near 82.
Monday Night
Mostly clear, with a low around 56.
Tuesday
Sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MT
 47.07°N 109.43°W (Elev. 3898 ft)
Last Update:
2:18 am MDT Jun 25, 2025
Forecast Valid:
4am MDT Jun 25, 2025-6pm MDT Jul 1, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation