Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. 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 MT

  • Today

    Today: Patchy smoke. Sunny, with a high near 84. West northwest wind 8 to 10 mph, with gusts as high as 20 mph.

    High: 84 °F

    Patchy Smoke

  • Tonight

    Tonight: Patchy smoke before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 53. Northwest wind 5 to 9 mph becoming light and variable  after midnight.

    Low: 53 °F

    Patchy Smoke
    then Partly
    Cloudy

  • Thursday

    Thursday: Sunny, with a high near 88. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 88 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 55. East southeast wind around 5 mph becoming calm  after midnight.

    Low: 55 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 85. Calm wind becoming east northeast 5 to 7 mph in the afternoon.

    High: 85 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 57. East southeast wind 8 to 13 mph, with gusts as high as 22 mph.

    Low: 57 °F

    Partly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers after noon.  Partly sunny, with a high near 87. East southeast wind 5 to 8 mph, with gusts as high as 18 mph.

    High: 87 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers before midnight.  Mostly cloudy, with a low around 56. South wind 5 to 8 mph.

    Low: 56 °F

    Chance
    Showers then
    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of showers and thunderstorms after noon.  Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
Patchy smoke. Sunny, with a high near 84. West northwest wind 8 to 10 mph, with gusts as high as 20 mph.
Tonight
Patchy smoke before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 53. Northwest wind 5 to 9 mph becoming light and variable after midnight.
Thursday
Sunny, with a high near 88. Calm wind becoming northwest around 6 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 55. East southeast wind around 5 mph becoming calm after midnight.
Friday
Sunny, with a high near 85. Calm wind becoming east northeast 5 to 7 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 57. East southeast wind 8 to 13 mph, with gusts as high as 22 mph.
Saturday
A 20 percent chance of showers after noon. Partly sunny, with a high near 87. East southeast wind 5 to 8 mph, with gusts as high as 18 mph.
Saturday Night
A chance of showers before midnight. Mostly cloudy, with a low around 56. South wind 5 to 8 mph.
Sunday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 85.
Sunday Night
A slight chance of showers before midnight. Mostly clear, with a low around 52.
Monday
Sunny, with a high near 83.
Monday Night
Partly cloudy, with a low around 54.
Tuesday
Mostly sunny, with a high near 86.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MT
 47.07°N 109.43°W (Elev. 3898 ft)
10:36 am MDT Aug 19, 2026
11am MDT Aug 19, 2026-6pm MDT Aug 25, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database