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

Monsoons Return to the Southwest U.S.; Potential Atlantic Tropical System Interaction

In Arizona and New Mexico, heavy to excessive rainfall from monsoon thunderstorms may bring isolated flash and urban flooding Thursday into Sunday. The close proximity of Tropical Storm Humberto and a tropical wave (AL94) could lead to interaction between them, and details of their long-range track and intensity forecasts, and any potential impacts, are more uncertain than usual. Read More >

Current conditions at

ROCKY BOY (RCBM8)

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

NA

47°F

8°C

Humidity 78%
Wind Speed SSE 0 MPH
Barometer NA
Dewpoint 40°F (4°C)
Visibility NA
Last update 24 Sep 10:18 PM MDT
Extended Forecast for

Big Sandy MT

  • Tonight

    Tonight: Mostly clear, with a low around 44. North wind around 6 mph becoming light and variable after midnight.

    Low: 44 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 84. South wind 3 to 8 mph.

    High: 84 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 48. South southeast wind 6 to 8 mph becoming west southwest after midnight. Winds could gust as high as 20 mph.

    Low: 48 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 74. West wind 6 to 8 mph.

    High: 74 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 45. West wind 6 to 9 mph becoming south southwest after midnight.

    Low: 45 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 82. South southwest wind around 6 mph.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 48. Calm wind becoming southeast around 6 mph in the evening.

    Low: 48 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 82. South wind around 5 mph becoming light and variable.

    High: 82 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 49.

    Low: 49 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 44. North wind around 6 mph becoming light and variable after midnight.
Thursday
Sunny, with a high near 84. South wind 3 to 8 mph.
Thursday Night
Mostly clear, with a low around 48. South southeast wind 6 to 8 mph becoming west southwest after midnight. Winds could gust as high as 20 mph.
Friday
Sunny, with a high near 74. West wind 6 to 8 mph.
Friday Night
Mostly clear, with a low around 45. West wind 6 to 9 mph becoming south southwest after midnight.
Saturday
Sunny, with a high near 82. South southwest wind around 6 mph.
Saturday Night
Mostly clear, with a low around 48. Calm wind becoming southeast around 6 mph in the evening.
Sunday
Sunny, with a high near 82. South wind around 5 mph becoming light and variable.
Sunday Night
Partly cloudy, with a low around 49.
Monday
Mostly sunny, with a high near 82.
Monday Night
A slight chance of rain. Mostly cloudy, with a low around 50.
Tuesday
Partly sunny, with a high near 75.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 47.
Wednesday
A slight chance of rain. Mostly sunny, with a high near 70.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Big Sandy MT
 48.18°N 110.11°W (Elev. 2759 ft)
Last Update:
8:00 pm MDT Sep 24, 2025
Forecast Valid:
11pm MDT Sep 24, 2025-6pm MDT Oct 1, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation