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

HORSE THIEF (HORM8)

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

NA

46°F

8°C

Humidity 61%
Wind Speed N 3 MPH
Barometer NA
Dewpoint 33°F (1°C)
Visibility NA
Last update 16 Sep 05:39 AM MDT
Extended Forecast for

Roundup MT

  • Today

    Today: Sunny, with a high near 68. North wind 7 to 14 mph.

    High: 68 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 42. North northeast wind 6 to 11 mph becoming light northeast in the evening.

    Low: 42 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly cloudy, with a high near 76. Calm wind becoming east southeast 5 to 7 mph in the afternoon.

    High: 76 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Cloudy, then gradually becoming partly cloudy, with a low around 51. East wind around 5 mph becoming calm in the evening.

    Low: 51 °F

    Decreasing
    Clouds

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 77. Calm wind becoming northeast 5 to 8 mph in the afternoon.

    High: 77 °F

    Mostly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 51. North wind 5 to 9 mph. Chance of precipitation is 90%.

    Low: 51 °F

    Showers

  • Saturday

    Saturday: Showers likely, with thunderstorms also possible after noon. Mostly cloudy, with a high near 69. North northwest wind 5 to 7 mph. Chance of precipitation is 70%.

    High: 69 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 47. North wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 50%.

    Low: 47 °F

    Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers, mainly before noon. Mostly sunny, with a high near 73. West southwest wind around 5 mph becoming north northwest in the afternoon.

    High: 73 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 68. North wind 7 to 14 mph.
Tonight
Mostly clear, with a low around 42. North northeast wind 6 to 11 mph becoming light northeast in the evening.
Thursday
Mostly cloudy, with a high near 76. Calm wind becoming east southeast 5 to 7 mph in the afternoon.
Thursday Night
Cloudy, then gradually becoming partly cloudy, with a low around 51. East wind around 5 mph becoming calm in the evening.
Friday
A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 77. Calm wind becoming northeast 5 to 8 mph in the afternoon.
Friday Night
Showers and possibly a thunderstorm. Low around 51. North wind 5 to 9 mph. Chance of precipitation is 90%.
Saturday
Showers likely, with thunderstorms also possible after noon. Mostly cloudy, with a high near 69. North northwest wind 5 to 7 mph. Chance of precipitation is 70%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 47. North wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 50%.
Sunday
A 30 percent chance of showers, mainly before noon. Mostly sunny, with a high near 73. West southwest wind around 5 mph becoming north northwest in the afternoon.
Sunday Night
Mostly clear, with a low around 46. North northeast wind around 6 mph becoming calm in the evening.
Monday
Sunny, with a high near 77. Southwest wind 3 to 7 mph.
Monday Night
Mostly clear, with a low around 47. Southeast wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 74. West southwest wind around 7 mph becoming north in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Roundup MT
 46.45°N 108.53°W (Elev. 3219 ft)
Last Update:
12:32 am MDT Sep 16, 2026
Forecast Valid:
6am MDT Sep 16, 2026-6pm MDT Sep 22, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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