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

34°F

1°C

Humidity 93%
Wind Speed N 5 MPH
Barometer NA
Dewpoint 32°F (0°C)
Visibility NA
Wind Chill29°F (-2°C)
Last update 17 May 11:18 PM MDT
Extended Forecast for

Big Sandy MT

  • Overnight

    Overnight: A chance of rain, mixing with snow after 1am, then gradually ending. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 29. North wind 5 to 7 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

    Low: 29 °F

    Chance
    Rain/Snow and
    Patchy Fog

  • Monday

    Monday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 54. North northwest wind 5 to 7 mph becoming northeast in the afternoon.

    High: 54 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 32. Northeast wind 5 to 10 mph becoming south southeast after midnight.

    Low: 32 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 65. South southeast wind 9 to 11 mph becoming southwest in the afternoon.

    High: 65 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41. South wind 5 to 9 mph.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 40 percent chance of rain after noon. Partly sunny, with a high near 63. Southwest wind 5 to 9 mph becoming north northwest in the afternoon.

    High: 63 °F

    Partly Sunny
    then Chance
    Rain

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 37. North northwest wind 5 to 10 mph becoming light and variable after midnight.

    Low: 37 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 68. West southwest wind 3 to 6 mph.

    High: 68 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A slight chance of rain after midnight. Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy
    then Slight
    Chance Rain

Detailed Forecast

Overnight
A chance of rain, mixing with snow after 1am, then gradually ending. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 29. North wind 5 to 7 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Monday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 54. North northwest wind 5 to 7 mph becoming northeast in the afternoon.
Monday Night
Mostly clear, with a low around 32. Northeast wind 5 to 10 mph becoming south southeast after midnight.
Tuesday
Mostly sunny, with a high near 65. South southeast wind 9 to 11 mph becoming southwest in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 41. South wind 5 to 9 mph.
Wednesday
A 40 percent chance of rain after noon. Partly sunny, with a high near 63. Southwest wind 5 to 9 mph becoming north northwest in the afternoon.
Wednesday Night
A 30 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 37. North northwest wind 5 to 10 mph becoming light and variable after midnight.
Thursday
Mostly sunny, with a high near 68. West southwest wind 3 to 6 mph.
Thursday Night
A slight chance of rain after midnight. Mostly cloudy, with a low around 42.
Friday
A slight chance of rain before noon, then a slight chance of showers and thunderstorms after noon. Partly sunny, with a high near 69.
Friday Night
Partly cloudy, with a low around 43.
Saturday
Mostly sunny, with a high near 78.
Saturday Night
Partly cloudy, with a low around 46.
Sunday
Mostly sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Big Sandy MT
 48.18°N 110.11°W (Elev. 2759 ft)
Last Update:
10:46 pm MDT May 17, 2026
Forecast Valid:
12am MDT May 18, 2026-6pm MDT May 24, 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