Thunderstorms and Heavy Rains Across Portions of the Central and Eastern US; Heat Expands to Portions of the East

Widespread showers and thunderstorms, some severe, may produce heavy downpours and flash flooding across much of the eastern and central U.S. Dangerous heat will continue in the Pacific Northwest and expand across portions of the East. Deep tropical moisture and associated thunderstorms will bring heavy rainfall and localized flash flooding across portions of Florida into the central Gulf Coast. Read More >

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

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

Rain

48°F

9°C

Humidity 93%
Wind Speed ESE 8 MPH
Barometer 30.25 in (1024.38 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 15 Jul 09:20 PM MDT
Extended Forecast for

Lewistown MT

  • Tonight

    Tonight: Showers, mainly before 5am.  Patchy fog after midnight. Low around 45. Northeast wind 6 to 9 mph.  Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 45 °F

    Showers and
    Patchy Fog

  • Wednesday

    Wednesday: A 50 percent chance of showers between 9am and noon.  Patchy fog before noon.  Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 64. East southeast wind 6 to 10 mph, with gusts as high as 18 mph.

    High: 64 °F

    Chance
    Showers and
    Patchy Fog
    then Partly
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 41. Southeast wind 6 to 10 mph, with gusts as high as 18 mph.

    Low: 41 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 79. Light and variable wind becoming north northwest 5 to 7 mph in the afternoon.

    High: 79 °F

    Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms before midnight.  Partly cloudy, with a low around 49. North wind 5 to 8 mph becoming calm  after midnight.

    Low: 49 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 77. Calm wind becoming north northwest around 6 mph in the afternoon.

    High: 77 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 52. Northeast wind 5 to 7 mph becoming southeast in the evening.

    Low: 52 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 86. South southeast wind 3 to 7 mph.

    High: 86 °F

    Sunny

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before midnight.  Partly cloudy, with a low around 53.

    Low: 53 °F

    Slight Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Tonight
Showers, mainly before 5am. Patchy fog after midnight. Low around 45. Northeast wind 6 to 9 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
A 50 percent chance of showers between 9am and noon. Patchy fog before noon. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 64. East southeast wind 6 to 10 mph, with gusts as high as 18 mph.
Wednesday Night
Mostly clear, with a low around 41. Southeast wind 6 to 10 mph, with gusts as high as 18 mph.
Thursday
Sunny, with a high near 79. Light and variable wind becoming north northwest 5 to 7 mph in the afternoon.
Thursday Night
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 49. North wind 5 to 8 mph becoming calm after midnight.
Friday
Mostly sunny, with a high near 77. Calm wind becoming north northwest around 6 mph in the afternoon.
Friday Night
Mostly clear, with a low around 52. Northeast wind 5 to 7 mph becoming southeast in the evening.
Saturday
Sunny, with a high near 86. South southeast wind 3 to 7 mph.
Saturday Night
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 53.
Sunday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 83.
Sunday Night
A slight chance of showers. Partly cloudy, with a low around 52.
Monday
A slight chance of showers. Mostly sunny, with a high near 81.
Monday Night
A chance of showers. Mostly cloudy, with a low around 50.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 73.
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MT
 47.07°N 109.43°W (Elev. 3898 ft)
8:53 pm MDT Jul 15, 2025
9pm MDT Jul 15, 2025-6pm MDT Jul 22, 2025
 
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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