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

Custer, Custer County Airport (KCUT)

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

Overcast

68°F

20°C

Humidity 59%
Wind Speed E 10 mph
Barometer 30.07 in (1012.1 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 1 Sep 3:53 pm MDT
Extended Forecast for

Keystone SD

  • This Afternoon

    This Afternoon: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 72. East wind around 5 mph, with gusts as high as 20 mph.

    High: 72 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 59. East wind around 5 mph becoming calm. Winds could gust as high as 16 mph.

    Low: 59 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 88. Southwest wind 6 to 11 mph, with gusts as high as 32 mph.

    High: 88 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 66. Southwest wind around 8 mph, with gusts as high as 28 mph.

    Low: 66 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 88. Southwest wind 6 to 8 mph, with gusts as high as 25 mph.

    High: 88 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 65. West wind 3 to 5 mph. Winds could gust as high as 21 mph.

    Low: 65 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

  • Saturday

    Saturday: A slight chance of showers and thunderstorms after noon. Sunny, with a high near 91.

    High: 91 °F

    Sunny then
    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 72. East wind around 5 mph, with gusts as high as 20 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 59. East wind around 5 mph becoming calm. Winds could gust as high as 16 mph.
Wednesday
Sunny, with a high near 88. Southwest wind 6 to 11 mph, with gusts as high as 32 mph.
Wednesday Night
Partly cloudy, with a low around 66. Southwest wind around 8 mph, with gusts as high as 28 mph.
Thursday
Sunny, with a high near 88. Southwest wind 6 to 8 mph, with gusts as high as 25 mph.
Thursday Night
Mostly clear, with a low around 65. West wind 3 to 5 mph. Winds could gust as high as 21 mph.
Friday
Sunny, with a high near 92.
Friday Night
Mostly clear, with a low around 69.
Saturday
A slight chance of showers and thunderstorms after noon. Sunny, with a high near 91.
Saturday Night
Partly cloudy, with a low around 65.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 81.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62.
Labor Day
A slight chance of showers and thunderstorms. Partly sunny, with a high near 82.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Tuesday
Mostly sunny, with a high near 82.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Keystone SD
 43.89°N 103.43°W (Elev. 4541 ft)
Last Update:
3:36 pm MDT Sep 1, 2026
Forecast Valid:
4pm MDT Sep 1, 2026-6pm MDT Sep 8, 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