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

ROCKY BOY (RCBM8)

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

NA

83°F

28°C

Humidity 12%
Wind Speed SSW 7 MPH
Barometer NA
Dewpoint 25°F (-4°C)
Visibility NA
Heat Index80°F (27°C)
Last update 25 May 03:18 PM MDT
Extended Forecast for

Big Sandy MT

  • Tonight

    Tonight: Increasing clouds, with a low around 59. East southeast wind 6 to 11 mph, with gusts as high as 18 mph.

    Low: 59 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Sunny through mid morning, then becoming mostly cloudy, with a high near 95. East southeast wind 5 to 14 mph, with gusts as high as 24 mph.

    High: 95 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms, mainly before 11pm. Mostly cloudy, with a low around 59. East southeast wind 5 to 11 mph, with gusts as high as 24 mph.

    Low: 59 °F

    Chance
    Showers then
    Mostly Cloudy

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 91. South southwest wind 3 to 8 mph.

    High: 91 °F

    Partly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Partly cloudy, with a low around 57. South southeast wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 20%.

    Low: 57 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 93. Light and variable wind becoming east southeast around 5 mph in the afternoon.

    High: 93 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 60. East southeast wind 6 to 8 mph.

    Low: 60 °F

    Partly Cloudy

  • Friday

    Friday: A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 89. Southeast wind 3 to 7 mph.

    High: 89 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before midnight, then a slight chance of rain after midnight. Mostly cloudy, with a low around 55.

    Low: 55 °F

    Chance
    Showers

Detailed Forecast

Tonight
Increasing clouds, with a low around 59. East southeast wind 6 to 11 mph, with gusts as high as 18 mph.
Tuesday
Sunny through mid morning, then becoming mostly cloudy, with a high near 95. East southeast wind 5 to 14 mph, with gusts as high as 24 mph.
Tuesday Night
A 50 percent chance of showers and thunderstorms, mainly before 11pm. Mostly cloudy, with a low around 59. East southeast wind 5 to 11 mph, with gusts as high as 24 mph.
Wednesday
A 40 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 91. South southwest wind 3 to 8 mph.
Wednesday Night
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Partly cloudy, with a low around 57. South southeast wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 93. Light and variable wind becoming east southeast around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 60. East southeast wind 6 to 8 mph.
Friday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 89. Southeast wind 3 to 7 mph.
Friday Night
A chance of showers and thunderstorms before midnight, then a slight chance of rain after midnight. Mostly cloudy, with a low around 55.
Saturday
A chance of rain, then showers likely and possibly a thunderstorm after noon. Mostly cloudy, with a high near 75.
Saturday Night
A chance of rain. Mostly cloudy, with a low around 48.
Sunday
A chance of rain and thunderstorms. Partly sunny, with a high near 76.
Sunday Night
A chance of rain and thunderstorms. Mostly cloudy, with a low around 48.
Monday
A slight chance of rain. Mostly sunny, with a high near 76.
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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:
12:56 pm MDT May 25, 2026
Forecast Valid:
4pm MDT May 25, 2026-6pm MDT Jun 1, 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