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

69°F

21°C

Humidity 57%
Wind Speed Vrbl 5 mph
Barometer 30.09 in (1013.1 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 1 Sep 1:53 pm MDT
Extended Forecast for

Keystone SD

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 71. Northeast wind around 6 mph, with gusts as high as 18 mph.

    High: 71 °F

    Chance
    Showers

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 59. East wind around 6 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 86. Southwest wind 6 to 11 mph, with gusts as high as 32 mph.

    High: 86 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 66. Southwest wind 7 to 9 mph, with gusts as high as 28 mph.

    Low: 66 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 87. Southwest wind 7 to 9 mph, with gusts as high as 25 mph.

    High: 87 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 65. West wind around 6 mph, with gusts as high as 21 mph.

    Low: 65 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 91.

    High: 91 °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 90.

    High: 90 °F

    Sunny then
    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 71. Northeast wind around 6 mph, with gusts as high as 18 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 59. East wind around 6 mph becoming calm. Winds could gust as high as 16 mph.
Wednesday
Sunny, with a high near 86. Southwest wind 6 to 11 mph, with gusts as high as 32 mph.
Wednesday Night
Partly cloudy, with a low around 66. Southwest wind 7 to 9 mph, with gusts as high as 28 mph.
Thursday
Sunny, with a high near 87. Southwest wind 7 to 9 mph, with gusts as high as 25 mph.
Thursday Night
Mostly clear, with a low around 65. West wind around 6 mph, with gusts as high as 21 mph.
Friday
Sunny, with a high near 91.
Friday Night
Mostly clear, with a low around 69.
Saturday
A slight chance of showers and thunderstorms after noon. Sunny, with a high near 90.
Saturday Night
Partly cloudy, with a low around 65.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 80.
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 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Keystone SD
 43.9°N 103.4°W (Elev. 4498 ft)
Last Update:
1:36 pm MDT Sep 1, 2026
Forecast Valid:
2pm MDT Sep 1, 2026-6pm MDT Sep 7, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation