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

86°F

30°C

Humidity 22%
Wind Speed S 6 MPH
Barometer NA
Dewpoint 43°F (6°C)
Visibility NA
Heat Index83°F (28°C)
Last update 03 Jul 02:39 PM MDT
Extended Forecast for

Roundup MT

  • This Afternoon

    This Afternoon: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. North wind 6 to 11 mph.

    High: 86 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 54. North wind 8 to 13 mph becoming light and variable.

    Low: 54 °F

    Chance
    T-storms then
    Mostly Clear

  • Independence Day

    Independence Day: Sunny and hot, with a high near 91. Southwest wind 3 to 8 mph.

    High: 91 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 59. Calm wind.

    Low: 59 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 91. Light and variable wind becoming northeast 5 to 8 mph in the morning.

    High: 91 °F

    Hot

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 60. Northeast wind around 7 mph becoming northwest after midnight.

    Low: 60 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 86. North wind 11 to 14 mph becoming east northeast in the afternoon.

    High: 86 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms, then a chance of showers after midnight. Mostly cloudy, with a low around 61. East wind 5 to 11 mph. Chance of precipitation is 30%.

    Low: 61 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 88. East northeast wind 3 to 6 mph. Chance of precipitation is 40%.

    High: 88 °F

    Slight Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

This Afternoon
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. North wind 6 to 11 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 54. North wind 8 to 13 mph becoming light and variable.
Independence Day
Sunny and hot, with a high near 91. Southwest wind 3 to 8 mph.
Saturday Night
Mostly clear, with a low around 59. Calm wind.
Sunday
Sunny and hot, with a high near 91. Light and variable wind becoming northeast 5 to 8 mph in the morning.
Sunday Night
A 30 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 60. Northeast wind around 7 mph becoming northwest after midnight.
Monday
Mostly sunny, with a high near 86. North wind 11 to 14 mph becoming east northeast in the afternoon.
Monday Night
A slight chance of showers and thunderstorms, then a chance of showers after midnight. Mostly cloudy, with a low around 61. East wind 5 to 11 mph. Chance of precipitation is 30%.
Tuesday
A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 88. East northeast wind 3 to 6 mph. Chance of precipitation is 40%.
Tuesday Night
A 30 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 59. North wind 5 to 7 mph becoming calm after midnight.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 92. Southwest wind 3 to 7 mph.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 61. North wind 5 to 8 mph becoming west after midnight.
Thursday
Sunny, with a high near 87. Northeast wind 5 to 8 mph.
Thursday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 58. North wind 5 to 8 mph becoming calm after midnight.
Friday
Sunny, with a high near 89. Calm wind becoming north around 6 mph 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:
12:38 pm MDT Jul 3, 2026
Forecast Valid:
3pm MDT Jul 3, 2026-6pm MDT Jul 10, 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