Heavy Rain and Flash Flooding in the West; Heat Expands in the Central U.S.

Monsoonal moisture will produce showers and thunderstorms with heavy rain over parts of the Southwest, Great Basin, and Central Rockies through Monday. Flash flooding is possible, especially in and around burn scars and in areas of steep terrain. Heat will persist across the Central U.S. early this week, spreading into the Ohio Valley and Mid-Atlantic later this week. Read More >

Current conditions at

ROCKY BOY (RCBM8)

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

NA

61°F

16°C

Humidity 39%
Wind Speed WSW 11 MPH
Barometer NA
Dewpoint 36°F (2°C)
Visibility NA
Last update 30 Aug 04:18 PM MDT
Extended Forecast for

Big Sandy MT

  • Tonight

    Tonight: Partly cloudy, with a low around 46. West wind 12 to 17 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 30 mph.

    Low: 46 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 76. West wind 5 to 7 mph becoming light and variable  in the afternoon.

    High: 76 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 48. Light and variable wind.

    Low: 48 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 86. Southeast wind 3 to 7 mph.

    High: 86 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 57. Southeast wind 7 to 13 mph, with gusts as high as 23 mph.

    Low: 57 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers after noon.  Mostly sunny, with a high near 86. Light and variable wind becoming south southwest 5 to 9 mph in the afternoon. Winds could gust as high as 21 mph.

    High: 86 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers before midnight.  Mostly cloudy, with a low around 51. Southwest wind 5 to 10 mph becoming light  after midnight.

    Low: 51 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 81. Light south southwest wind becoming west southwest 8 to 13 mph in the morning.

    High: 81 °F

    Mostly Sunny

  • Thursday Night

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

    Low: 49 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 46. West wind 12 to 17 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 30 mph.
Monday
Sunny, with a high near 76. West wind 5 to 7 mph becoming light and variable in the afternoon.
Monday Night
Mostly clear, with a low around 48. Light and variable wind.
Tuesday
Mostly sunny, with a high near 86. Southeast wind 3 to 7 mph.
Tuesday Night
Partly cloudy, with a low around 57. Southeast wind 7 to 13 mph, with gusts as high as 23 mph.
Wednesday
A 30 percent chance of showers after noon. Mostly sunny, with a high near 86. Light and variable wind becoming south southwest 5 to 9 mph in the afternoon. Winds could gust as high as 21 mph.
Wednesday Night
A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 51. Southwest wind 5 to 10 mph becoming light after midnight.
Thursday
Mostly sunny, with a high near 81. Light south southwest wind becoming west southwest 8 to 13 mph in the morning.
Thursday Night
Partly cloudy, with a low around 49.
Friday
Sunny, with a high near 82.
Friday Night
Partly cloudy, with a low around 51.
Saturday
Mostly sunny, with a high near 82.
Saturday Night
Partly cloudy, with a low around 52.
Sunday
A chance of showers. Partly sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
Big Sandy MT
 48.18°N 110.11°W (Elev. 2759 ft)
12:31 pm MDT Aug 30, 2026
5pm MDT Aug 30, 2026-6pm MDT Sep 6, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database