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

  • Overnight

    Overnight: Mostly clear, with a steady temperature around 57. South southwest wind around 7 mph.

    Low: 57 °F

    Mostly Clear

  • Wednesday

    Wednesday: Patchy smoke after 11am. Partly sunny, then gradually becoming sunny, with a high near 84. South southwest wind 6 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.

    High: 84 °F

    Patchy Smoke

  • Wednesday Night

    Wednesday Night: Patchy smoke before 8pm. Mostly clear, with a low around 53. Northwest wind 5 to 10 mph becoming southeast in the evening.

    Low: 53 °F

    Patchy Smoke
    then Mostly
    Clear

  • Thursday

    Thursday: Sunny, with a high near 88. Southeast wind around 6 mph becoming calm.

    High: 88 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 55. North northwest wind around 5 mph becoming calm  after midnight.

    Low: 55 °F

    Mostly Clear

  • 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 slight 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.

    Low: 56 °F

    Chance
    Showers then
    Mostly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a steady temperature around 57. South southwest wind around 7 mph.
Wednesday
Patchy smoke after 11am. Partly sunny, then gradually becoming sunny, with a high near 84. South southwest wind 6 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.
Wednesday Night
Patchy smoke before 8pm. Mostly clear, with a low around 53. Northwest wind 5 to 10 mph becoming southeast in the evening.
Thursday
Sunny, with a high near 88. Southeast wind around 6 mph becoming calm.
Thursday Night
Mostly clear, with a low around 55. North northwest 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 slight 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.
Sunday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 85.
Sunday Night
A slight chance of showers. 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.
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MT
 47.07°N 109.43°W (Elev. 3898 ft)
12:31 am MDT Aug 19, 2026
3am MDT Aug 19, 2026-6pm MDT Aug 25, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database