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

Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds from the Upper Midwest into the Northeast

A prolonged atmospheric river will continue to impact the Pacific Northwest into the Northern Rockies with heavy rainfall, areas of urban and river flooding, landslides, heavy mountain snow, and gusty winds into Thursday. A strong clipper system will bring the threat of heavy snow and high winds across the Upper Midwest/Great Lakes as well as portions of the interior Northeast and Appalachians. Read More >

Current conditions at

Custer, Custer County Airport (KCUT)

Lat: 43.73°NLon: 103.62°WElev: 5600ft.

Fair

30°F

-1°C

Humidity 47%
Wind Speed NW 10 G 22 mph
Barometer 30.02 in (1018.4 mb)
Dewpoint 12°F (-11°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 10 Dec 4:53 am MST
Extended Forecast for

3 Miles NE Keystone SD

  • Today

    Today: A chance of snow between 11am and 4pm, then a chance of rain after 4pm. Mostly cloudy, with a high near 44. West wind 5 to 7 mph becoming southeast in the morning. Winds could gust as high as 22 mph. Chance of precipitation is 30%.

    High: 44 °F

    Slight Chance
    Snow then
    Chance
    Rain/Snow

  • Tonight

    Tonight: A 30 percent chance of rain before 8pm. Mostly cloudy, with a temperature rising to around 46 by 4am. Northwest wind 7 to 9 mph, with gusts as high as 22 mph.

    Low: 40 °F⇑

    Chance Rain
    then Partly
    Cloudy

  • Thursday

    Thursday: A 20 percent chance of rain after 11am. Mostly sunny, with a high near 57. West wind 10 to 14 mph, with gusts as high as 36 mph.

    High: 57 °F

    Slight Chance
    Rain

  • Thursday Night

    Thursday Night: A chance of rain before 8pm, then a chance of rain and snow between 8pm and 10pm, then a chance of snow after 10pm. Mostly cloudy, with a low around 22. Northwest wind 5 to 11 mph, with gusts as high as 32 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.

    Low: 22 °F

    Chance
    Rain/Snow
    then Chance
    Snow

  • Friday

    Friday: Snow likely, mainly after 11am. Cloudy, with a temperature rising to near 27 by noon, then falling to around 22 during the remainder of the day. East wind around 6 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

    High: 27 °F⇓

    Snow Likely

  • Friday Night

    Friday Night: A 30 percent chance of snow, mainly before 11pm. Mostly cloudy, with a steady temperature around 20. Light and variable wind becoming southeast around 5 mph in the evening.

    Low: 20 °F

    Chance Snow

  • Saturday

    Saturday: A 30 percent chance of snow, mainly before 11am. Partly sunny, with a high near 25. North wind around 6 mph becoming light and variable in the afternoon. Winds could gust as high as 16 mph.

    High: 25 °F

    Chance Snow

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 13. Light and variable wind becoming southwest 5 to 7 mph in the evening. Winds could gust as high as 16 mph.

    Low: 13 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

Detailed Forecast

Today
A chance of snow between 11am and 4pm, then a chance of rain after 4pm. Mostly cloudy, with a high near 44. West wind 5 to 7 mph becoming southeast in the morning. Winds could gust as high as 22 mph. Chance of precipitation is 30%.
Tonight
A 30 percent chance of rain before 8pm. Mostly cloudy, with a temperature rising to around 46 by 4am. Northwest wind 7 to 9 mph, with gusts as high as 22 mph.
Thursday
A 20 percent chance of rain after 11am. Mostly sunny, with a high near 57. West wind 10 to 14 mph, with gusts as high as 36 mph.
Thursday Night
A chance of rain before 8pm, then a chance of rain and snow between 8pm and 10pm, then a chance of snow after 10pm. Mostly cloudy, with a low around 22. Northwest wind 5 to 11 mph, with gusts as high as 32 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.
Friday
Snow likely, mainly after 11am. Cloudy, with a temperature rising to near 27 by noon, then falling to around 22 during the remainder of the day. East wind around 6 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Friday Night
A 30 percent chance of snow, mainly before 11pm. Mostly cloudy, with a steady temperature around 20. Light and variable wind becoming southeast around 5 mph in the evening.
Saturday
A 30 percent chance of snow, mainly before 11am. Partly sunny, with a high near 25. North wind around 6 mph becoming light and variable in the afternoon. Winds could gust as high as 16 mph.
Saturday Night
Partly cloudy, with a low around 13. Light and variable wind becoming southwest 5 to 7 mph in the evening. Winds could gust as high as 16 mph.
Sunday
Sunny, with a high near 52.
Sunday Night
Mostly clear, with a low around 32.
Monday
Sunny, with a high near 52.
Monday Night
Partly cloudy, with a low around 35.
Tuesday
Mostly sunny, with a high near 54.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NE Keystone SD
 43.92°N 103.38°W (Elev. 4416 ft)
Last Update:
4:16 am MST Dec 10, 2025
Forecast Valid:
5am MST Dec 10, 2025-6pm MST Dec 16, 2025
 
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