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

Storm Systems to Impact the Central and Eastern U.S. Through the Weekend

Two storm systems will track through the central and eastern U.S. today through this weekend with areas of gusty winds, rain and heavy snow. Severe thunderstorms and heavy to excessive rainfall is forecast today from the Lower Mississippi River Valley to the Tennessee Valley. Damaging winds, a few tornadoes, and areas of flooding are possible. Read More >

Hazardous Weather Conditions

Current conditions at

Custer, Custer County Airport (KCUT)

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

Fair

20°F

-7°C

Humidity 55%
Wind Speed W 10 mph
Barometer 30.18 in (1027.7 mb)
Dewpoint 6°F (-14°C)
Visibility 10.00 mi
Wind Chill9°F (-13°C)
Last update 9 Jan 4:53 pm MST
Extended Forecast for

Keystone SD

  • Tonight

    Tonight: Partly cloudy, with a temperature rising to around 30 by 5am. Wind chill values as low as 16. Northwest wind 6 to 10 mph, with gusts as high as 25 mph.

    Low: 24 °F⇑

    Partly Cloudy

  • Saturday

    Saturday: A 30 percent chance of snow, mainly before 11am. Mostly sunny, with a high near 41. Wind chill values as low as 20. Northwest wind 8 to 14 mph, with gusts as high as 20 mph.

    High: 41 °F

    Chance Snow

  • Saturday Night

    Saturday Night: Partly cloudy, with a steady temperature around 39. West wind around 7 mph.

    Low: 39 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 54. West wind 6 to 8 mph, with gusts as high as 24 mph.

    High: 54 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 36. West wind around 7 mph, with gusts as high as 21 mph.

    Low: 36 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 58. West wind 7 to 10 mph, with gusts as high as 29 mph.

    High: 58 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 43. Northwest wind 8 to 14 mph, with gusts as high as 38 mph.

    Low: 43 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of rain after 11am. Partly sunny, with a high near 52. Northwest wind 11 to 14 mph, with gusts as high as 41 mph.

    High: 52 °F

    Slight Chance
    Rain

  • Tuesday Night

    Tuesday Night: A slight chance of rain, mixing with snow after 9pm, then gradually ending. Mostly cloudy, with a low around 36.

    Low: 36 °F

    Slight Chance
    Rain/Snow
    then Partly
    Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a temperature rising to around 30 by 5am. Wind chill values as low as 16. Northwest wind 6 to 10 mph, with gusts as high as 25 mph.
Saturday
A 30 percent chance of snow, mainly before 11am. Mostly sunny, with a high near 41. Wind chill values as low as 20. Northwest wind 8 to 14 mph, with gusts as high as 20 mph.
Saturday Night
Partly cloudy, with a steady temperature around 39. West wind around 7 mph.
Sunday
Mostly sunny, with a high near 54. West wind 6 to 8 mph, with gusts as high as 24 mph.
Sunday Night
Partly cloudy, with a low around 36. West wind around 7 mph, with gusts as high as 21 mph.
Monday
Mostly sunny, with a high near 58. West wind 7 to 10 mph, with gusts as high as 29 mph.
Monday Night
Mostly cloudy, with a low around 43. Northwest wind 8 to 14 mph, with gusts as high as 38 mph.
Tuesday
A slight chance of rain after 11am. Partly sunny, with a high near 52. Northwest wind 11 to 14 mph, with gusts as high as 41 mph.
Tuesday Night
A slight chance of rain, mixing with snow after 9pm, then gradually ending. Mostly cloudy, with a low around 36.
Wednesday
Mostly sunny, with a high near 49.
Wednesday Night
Mostly clear, with a low around 35.
Thursday
Sunny, with a high near 46.
Thursday Night
A slight chance of snow. Mostly cloudy, with a low around 23.
Friday
A slight chance of snow. Partly sunny, with a high near 31.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Keystone SD
 43.89°N 103.43°W (Elev. 4541 ft)
Last Update:
4:36 pm MST Jan 9, 2026
Forecast Valid:
5pm MST Jan 9, 2026-6pm MST Jan 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation