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

57°F

14°C

Humidity 31%
Wind Speed WNW 10 MPH
Barometer NA
Dewpoint 26°F (-3°C)
Visibility NA
Last update 15 May 03:18 PM MDT
Extended Forecast for

Big Sandy MT

  • Tonight

    Tonight: Mostly cloudy, with a low around 39. West wind 11 to 16 mph becoming light and variable. Winds could gust as high as 24 mph.

    Low: 39 °F

    Mostly Cloudy

  • Saturday

    Saturday: A slight chance of rain before 4pm, then a slight chance of rain after 5pm. Mostly cloudy, with a high near 61. West southwest wind 5 to 9 mph. Chance of precipitation is 20%.

    High: 61 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: A 40 percent chance of rain, mainly after 9pm. Cloudy, with a low around 35. Southwest wind 6 to 8 mph.

    Low: 35 °F

    Chance Rain

  • Sunday

    Sunday: Rain. High near 46. North wind 11 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 80%.

    High: 46 °F

    Rain

  • Sunday Night

    Sunday Night: A 50 percent chance of rain before midnight. Cloudy, with a low around 30. North wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 30 °F

    Chance Rain
    then Cloudy

  • Monday

    Monday: Partly sunny, with a high near 52. North wind around 6 mph.

    High: 52 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 30. North northeast wind around 6 mph becoming light and variable in the evening.

    Low: 30 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 62. Light and variable wind becoming south around 5 mph in the morning.

    High: 62 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 37.

    Low: 37 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 39. West wind 11 to 16 mph becoming light and variable. Winds could gust as high as 24 mph.
Saturday
A slight chance of rain before 4pm, then a slight chance of rain after 5pm. Mostly cloudy, with a high near 61. West southwest wind 5 to 9 mph. Chance of precipitation is 20%.
Saturday Night
A 40 percent chance of rain, mainly after 9pm. Cloudy, with a low around 35. Southwest wind 6 to 8 mph.
Sunday
Rain. High near 46. North wind 11 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 80%.
Sunday Night
A 50 percent chance of rain before midnight. Cloudy, with a low around 30. North wind 5 to 15 mph, with gusts as high as 25 mph.
Monday
Partly sunny, with a high near 52. North wind around 6 mph.
Monday Night
Partly cloudy, with a low around 30. North northeast wind around 6 mph becoming light and variable in the evening.
Tuesday
Mostly sunny, with a high near 62. Light and variable wind becoming south around 5 mph in the morning.
Tuesday Night
Partly cloudy, with a low around 37.
Wednesday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 66.
Wednesday Night
Mostly cloudy, with a low around 40.
Thursday
Mostly sunny, with a high near 71.
Thursday Night
A slight chance of rain. Mostly cloudy, with a low around 43.
Friday
A slight chance of rain and thunderstorms. Mostly sunny, with a high near 70.
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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:
12:32 pm MDT May 15, 2026
Forecast Valid:
3pm MDT May 15, 2026-6pm MDT May 22, 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