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

Extreme Heat Across the Southern U.S.; Severe Thunderstorms and Heavy Rain in the Northern Plains and Upper Midwest

Dangerous heat will remain across portions of the southern U.S. through the weekend. A heat wave over the Southwest will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Severe thunderstorms will produce damaging winds and heavy rainfall over portions of the northern/central Plains into the mid/upper-Mississippi Valleys today. Read More >

Hazardous Weather Conditions

Current conditions at

HORSE THIEF (HORM8)

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

NA

80°F

27°C

Humidity 34%
Wind Speed WSW 3 MPH
Barometer NA
Dewpoint 49°F (9°C)
Visibility NA
Heat Index79°F (26°C)
Last update 30 Jul 09:39 AM MDT
Extended Forecast for

Roundup MT

Extreme Heat Watch August 1, 12:00pm until August 2, 12:00am
Click here for hazard details and duration
Extreme Heat Watch

  • Today

    Today: A slight chance of showers before 11am, then a slight chance of showers and thunderstorms after 3pm. Patchy smoke after noon. Increasing clouds and hot, with a high near 95. West southwest wind 5 to 8 mph becoming east in the afternoon. Chance of precipitation is 20%.

    High: 95 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms. Patchy smoke before midnight. Partly cloudy, with a low around 63. East wind 5 to 8 mph becoming light and variable. Chance of precipitation is 20%.

    Low: 63 °F

    Slight Chance
    T-storms

  • Friday

    Friday: Patchy smoke after 3pm. Mostly cloudy, then gradually becoming sunny and hot, with a high near 98. Southwest wind around 6 mph becoming north northeast in the afternoon.

    High: 98 °F

    Mostly Sunny
    then Patchy
    Smoke

  • Friday Night

    Friday Night: Mostly clear, with a low around 64. North northeast wind around 6 mph becoming calm in the evening.

    Low: 64 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 107. Light west southwest wind becoming south 5 to 10 mph in the morning.

    High: 107 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 69. South wind 5 to 9 mph becoming west northwest after midnight.

    Low: 69 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 95. North northwest wind 6 to 9 mph becoming east northeast in the afternoon.

    High: 95 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 60. North wind 14 to 16 mph.

    Low: 60 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 78. North wind 13 to 16 mph.

    High: 78 °F

    Sunny

Detailed Forecast

Today
A slight chance of showers before 11am, then a slight chance of showers and thunderstorms after 3pm. Patchy smoke after noon. Increasing clouds and hot, with a high near 95. West southwest wind 5 to 8 mph becoming east in the afternoon. Chance of precipitation is 20%.
Tonight
A slight chance of showers and thunderstorms. Patchy smoke before midnight. Partly cloudy, with a low around 63. East wind 5 to 8 mph becoming light and variable. Chance of precipitation is 20%.
Friday
Patchy smoke after 3pm. Mostly cloudy, then gradually becoming sunny and hot, with a high near 98. Southwest wind around 6 mph becoming north northeast in the afternoon.
Friday Night
Mostly clear, with a low around 64. North northeast wind around 6 mph becoming calm in the evening.
Saturday
Sunny and hot, with a high near 107. Light west southwest wind becoming south 5 to 10 mph in the morning.
Saturday Night
Mostly clear, with a low around 69. South wind 5 to 9 mph becoming west northwest after midnight.
Sunday
Sunny and hot, with a high near 95. North northwest wind 6 to 9 mph becoming east northeast in the afternoon.
Sunday Night
Mostly clear, with a low around 60. North wind 14 to 16 mph.
Monday
Sunny, with a high near 78. North wind 13 to 16 mph.
Monday Night
Partly cloudy, with a low around 51. North wind 8 to 13 mph becoming light after midnight.
Tuesday
Sunny, with a high near 81. Calm wind becoming east northeast 5 to 8 mph in the morning.
Tuesday Night
Mostly clear, with a low around 53. East northeast wind 5 to 9 mph becoming calm after midnight.
Wednesday
Sunny and hot, with a high near 90. Calm wind becoming east southeast 5 to 7 mph in the afternoon.
Basemap Options
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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:
8:13 am MDT Jul 30, 2026
Forecast Valid:
9am MDT Jul 30, 2026-6pm MDT Aug 5, 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