Dangerous Heat in the Southwest; Severe Thunderstorms and Heavy Rain in the Northeast and Mid-Atlantic

Dangerous heat will persist across the Southwest U.S. through Friday with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week. Strong to severe thunderstorms may produce damaging wind, hail, a tornado or two, heavy rain and flash flooding across parts of the Mid-Atlantic and Northeast. Heavy rainfall threat continues across the Gulf Coast. Read More >

Current conditions at

HORSE THIEF (HORM8)

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

NA

57°F

14°C

Humidity 66%
Wind Speed WNW 2 MPH
Barometer NA
Dewpoint 46°F (8°C)
Visibility NA
Last update 27 Aug 05:39 AM MDT
Extended Forecast for

Roundup MT

  • Today

    Today: Increasing clouds and hot, with a high near 97. Light and variable wind becoming south southeast 5 to 8 mph in the morning.

    High: 97 °F

    Hot

  • Tonight

    Tonight: A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight.  Mostly cloudy, with a low around 62. South wind 5 to 8 mph becoming light and variable.  Chance of precipitation is 30%.

    Low: 62 °F

    Chance
    Showers then
    Mostly Cloudy

  • Friday

    Friday: A slight chance of showers, then a chance of showers and thunderstorms after 3pm.  Cloudy, with a high near 89. Light and variable wind becoming south southwest around 6 mph in the afternoon.  Chance of precipitation is 30%.

    High: 89 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms, then a chance of showers after 9pm.  Mostly cloudy, with a low around 59. West southwest wind 3 to 6 mph.  Chance of precipitation is 30%.

    Low: 59 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: A chance of showers before noon, then a chance of showers and thunderstorms between noon and 3pm, then a chance of showers after 3pm.  Cloudy, then gradually becoming mostly sunny, with a high near 82. West southwest wind 5 to 7 mph becoming south in the afternoon.  Chance of precipitation is 30%.

    High: 82 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms after midnight.  Mostly cloudy, with a low around 54. South southeast wind around 6 mph becoming calm  in the evening.  Chance of precipitation is 60%.

    Low: 54 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon.  Partly sunny, with a high near 78. Light west wind increasing to 11 to 16 mph in the morning.  Chance of precipitation is 60%.

    High: 78 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A 20 percent chance of showers before midnight.  Mostly clear, with a low around 47. West southwest wind 5 to 15 mph.

    Low: 47 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 80. West southwest wind around 9 mph.

    High: 80 °F

    Sunny

Detailed Forecast

Today
Increasing clouds and hot, with a high near 97. Light and variable wind becoming south southeast 5 to 8 mph in the morning.
Tonight
A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, with a low around 62. South wind 5 to 8 mph becoming light and variable. Chance of precipitation is 30%.
Friday
A slight chance of showers, then a chance of showers and thunderstorms after 3pm. Cloudy, with a high near 89. Light and variable wind becoming south southwest around 6 mph in the afternoon. Chance of precipitation is 30%.
Friday Night
A slight chance of showers and thunderstorms, then a chance of showers after 9pm. Mostly cloudy, with a low around 59. West southwest wind 3 to 6 mph. Chance of precipitation is 30%.
Saturday
A chance of showers before noon, then a chance of showers and thunderstorms between noon and 3pm, then a chance of showers after 3pm. Cloudy, then gradually becoming mostly sunny, with a high near 82. West southwest wind 5 to 7 mph becoming south in the afternoon. Chance of precipitation is 30%.
Saturday Night
Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 54. South southeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 60%.
Sunday
Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 78. Light west wind increasing to 11 to 16 mph in the morning. Chance of precipitation is 60%.
Sunday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 47. West southwest wind 5 to 15 mph.
Monday
Sunny, with a high near 80. West southwest wind around 9 mph.
Monday Night
Partly cloudy, with a low around 51. South southwest wind around 6 mph becoming calm after midnight.
Tuesday
Mostly sunny, with a high near 86. Southwest wind 3 to 7 mph.
Tuesday Night
Partly cloudy, with a low around 53. West wind 3 to 7 mph.
Wednesday
Mostly sunny, with a high near 85. West southwest wind 6 to 10 mph.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Roundup MT
 46.45°N 108.53°W (Elev. 3219 ft)
12:32 am MDT Aug 27, 2026
5am MDT Aug 27, 2026-6pm MDT Sep 2, 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