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

Heavy Rainfall for the Mid-Atlantic; Heat and Wildfire Concerns for the West

Slow moving showers and thunderstorms may result in flash flooding for portions of the mid-Atlantic region today into tonight. Meanwhile, excessive heat will continue to build across the West through Tuesday. Heat Advisories and Extreme Heat Warnings are in effect. Fire Weather concerns continue for the interior Northwest with dry and breezy conditions. Watching the tropics across the Southeast. Read More >

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

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

Clear

91°F

33°C

Humidity 21%
Wind Speed N 6 MPH
Barometer 29.92 in (1013.21 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 14 Jul 04:50 PM MDT
Extended Forecast for

Lewistown Municipal MT

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely after 3am. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 50. North northeast wind 8 to 11 mph, with gusts as high as 20 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

    Chance
    T-storms then
    Showers
    Likely and
    Patchy Fog

  • Tuesday

    Tuesday: Showers, with thunderstorms also possible after 9am. Patchy fog before 7am. High near 56. Northeast wind 8 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 56 °F

    Showers and
    Patchy Fog

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Patchy fog after midnight. Low around 45. Northeast wind 7 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 45 °F

    Showers and
    Patchy Fog

  • Wednesday

    Wednesday: A 50 percent chance of showers. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 62. East northeast wind 6 to 9 mph.

    High: 62 °F

    Chance
    Showers and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 42. East southeast wind 6 to 9 mph.

    Low: 42 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 79. South southeast wind 5 to 7 mph becoming east northeast in the afternoon.

    High: 79 °F

    Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 49. East northeast wind 5 to 8 mph becoming west southwest after midnight.

    Low: 49 °F

    Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 75. Light and variable wind becoming northwest 5 to 7 mph in the morning.

    High: 75 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

Detailed Forecast

Tonight
A chance of showers and thunderstorms, then showers likely after 3am. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 50. North northeast wind 8 to 11 mph, with gusts as high as 20 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 9am. Patchy fog before 7am. High near 56. Northeast wind 8 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday Night
Showers and possibly a thunderstorm. Patchy fog after midnight. Low around 45. Northeast wind 7 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
A 50 percent chance of showers. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 62. East northeast wind 6 to 9 mph.
Wednesday Night
Partly cloudy, with a low around 42. East southeast wind 6 to 9 mph.
Thursday
Sunny, with a high near 79. South southeast wind 5 to 7 mph becoming east northeast in the afternoon.
Thursday Night
A 30 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 49. East northeast wind 5 to 8 mph becoming west southwest after midnight.
Friday
Mostly sunny, with a high near 75. Light and variable wind becoming northwest 5 to 7 mph in the morning.
Friday Night
Mostly clear, with a low around 51.
Saturday
A slight chance of showers and thunderstorms after noon. Sunny, with a high near 83.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 54.
Sunday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 53.
Monday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 79.
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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:
2:23 pm MDT Jul 14, 2025
Forecast Valid:
5pm MDT Jul 14, 2025-6pm MDT Jul 21, 2025
 
Forecast Discussion
 
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Additional Resources

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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