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

Thunderstorms and Heavy Rainfall in the Plains; Hazardous Heat in the South and Southeast

Severe thunderstorms will be possible across the northern/central Plains through Tuesday afternoon and from the central Plains to the Mid-Mississippi Valley Tuesday evening through Wednesday morning. Storms may produce large hail and damaging wind gusts, and heavy rainfall may lead to scattered instances of flash flooding. Meanwhile, hazardous heat persists across the South and Southeast. Read More >

Current conditions at

HORSE THIEF (HORM8)

Lat: 46.42581°NLon: 108.6745°WElev: 3414.0ft.

NA

61°F

16°C

Humidity 86%
Wind Speed WNW 1 MPH
Barometer NA
Dewpoint 57°F (14°C)
Visibility NA
Last update 17 Aug 11:39 PM MDT
Extended Forecast for

Roundup MT

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before midnight, then a slight chance of showers between midnight and 2am. Mostly cloudy, with a low around 55. Calm wind. Chance of precipitation is 20%.

    Low: 55 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A slight chance of showers before 8am, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 84. Calm wind becoming north northwest 5 to 7 mph in the afternoon. Chance of precipitation is 40%.

    High: 84 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 54. Calm wind becoming west southwest 5 to 7 mph after midnight. Chance of precipitation is 20%.

    Low: 54 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: Patchy smoke after 3pm. Sunny, with a high near 88. West southwest wind around 9 mph.

    High: 88 °F

    Sunny then
    Patchy Smoke

  • Wednesday Night

    Wednesday Night: Patchy smoke before 9pm. Mostly clear, with a low around 56. North northwest wind around 6 mph becoming calm in the evening.

    Low: 56 °F

    Patchy Smoke
    then Partly
    Cloudy

  • Thursday

    Thursday: Sunny and hot, with a high near 92. Light and variable wind becoming west southwest around 6 mph in the morning.

    High: 92 °F

    Hot

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 58. North northeast wind 5 to 9 mph becoming light after midnight.

    Low: 58 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 89. North wind 5 to 9 mph becoming east in the afternoon.

    High: 89 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 61. East wind 5 to 9 mph.

    Low: 61 °F

    Partly Cloudy

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms before midnight, then a slight chance of showers between midnight and 2am. Mostly cloudy, with a low around 55. Calm wind. Chance of precipitation is 20%.
Tuesday
A slight chance of showers before 8am, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 84. Calm wind becoming north northwest 5 to 7 mph in the afternoon. Chance of precipitation is 40%.
Tuesday Night
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 54. Calm wind becoming west southwest 5 to 7 mph after midnight. Chance of precipitation is 20%.
Wednesday
Patchy smoke after 3pm. Sunny, with a high near 88. West southwest wind around 9 mph.
Wednesday Night
Patchy smoke before 9pm. Mostly clear, with a low around 56. North northwest wind around 6 mph becoming calm in the evening.
Thursday
Sunny and hot, with a high near 92. Light and variable wind becoming west southwest around 6 mph in the morning.
Thursday Night
Partly cloudy, with a low around 58. North northeast wind 5 to 9 mph becoming light after midnight.
Friday
Sunny, with a high near 89. North wind 5 to 9 mph becoming east in the afternoon.
Friday Night
Partly cloudy, with a low around 61. East wind 5 to 9 mph.
Saturday
A 20 percent chance of showers. Partly sunny and hot, with a high near 90. Calm wind becoming south southeast 5 to 8 mph in the afternoon.
Saturday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 60. South southeast wind 5 to 8 mph becoming light and variable in the evening.
Sunday
Mostly sunny, with a high near 88. West southwest wind 5 to 7 mph.
Sunday Night
A 30 percent chance of showers. Partly cloudy, with a low around 57. Northwest wind 5 to 9 mph becoming calm after midnight.
Monday
Sunny, with a high near 86. Calm wind becoming west southwest around 5 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Roundup MT
 46.45°N 108.53°W (Elev. 3219 ft)
Last Update:
11:11 pm MDT Aug 17, 2026
Forecast Valid:
11pm MDT Aug 17, 2026-6pm MDT Aug 24, 2026
 
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