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

Areas of Severe Thunderstorms and Excessive Rainfall; Heat Wave Builds in the Intermountain West and Plains

A slow moving front will bring rounds of strong to severe thunderstorms and heavy rainfall to the central Plains eastward to the east-central U.S.. The first widespread significant heat wave of summer for the Intermountain West and Plains is expected to develop today and expand through next week. Dangerous heat will continue to impact portions of the Southwest and Southeast. Read More >

Hazardous Weather Conditions

Current conditions at

ROCKY BOY (RCBM8)

Lat: 48.25529°NLon: 109.78592°WElev: 3789.0ft.

NA

78°F

26°C

Humidity 32%
Wind Speed W 6 MPH
Barometer NA
Dewpoint 46°F (8°C)
Visibility NA
Heat Index78°F (26°C)
Last update 10 Jul 11:18 AM MDT
Extended Forecast for

Big Sandy MT

Heat Advisory July 11, 12:00pm until July 13, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • This Afternoon

    This Afternoon: Sunny, with a high near 93. West southwest wind 3 to 5 mph.

    High: 93 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 61. Calm wind becoming east around 5 mph.

    Low: 61 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 101. South wind 5 to 11 mph becoming west southwest in the afternoon. Winds could gust as high as 22 mph.

    High: 101 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 63. West wind 5 to 9 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny and hot, with a high near 101. Southeast wind 5 to 13 mph becoming west northwest in the afternoon. Winds could gust as high as 24 mph.

    High: 101 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 64. North northwest wind 6 to 11 mph becoming light and variable after midnight. Winds could gust as high as 22 mph.

    Low: 64 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny and hot, with a high near 99. Light east southeast wind.

    High: 99 °F

    Hot

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 67. East wind 5 to 7 mph.

    Low: 67 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers before noon. Partly sunny, with a high near 93.

    High: 93 °F

    Chance
    Showers then
    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 93. West southwest wind 3 to 5 mph.
Tonight
Mostly clear, with a low around 61. Calm wind becoming east around 5 mph.
Saturday
Sunny and hot, with a high near 101. South wind 5 to 11 mph becoming west southwest in the afternoon. Winds could gust as high as 22 mph.
Saturday Night
Mostly clear, with a low around 63. West wind 5 to 9 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.
Sunday
Partly sunny and hot, with a high near 101. Southeast wind 5 to 13 mph becoming west northwest in the afternoon. Winds could gust as high as 24 mph.
Sunday Night
Mostly cloudy, with a low around 64. North northwest wind 6 to 11 mph becoming light and variable after midnight. Winds could gust as high as 22 mph.
Monday
Mostly sunny and hot, with a high near 99. Light east southeast wind.
Monday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 67. East wind 5 to 7 mph.
Tuesday
A chance of showers before noon. Partly sunny, with a high near 93.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 62.
Wednesday
A chance of showers. Partly sunny, with a high near 88.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 60.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Big Sandy MT
 48.16°N 110.1°W (Elev. 2717 ft)
Last Update:
10:56 am MDT Jul 10, 2026
Forecast Valid:
12pm MDT Jul 10, 2026-6pm MDT Jul 16, 2026
 
Forecast Discussion
 
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Additional Resources

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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