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

Severe Weather and Flooding Threats for the Central U.S.; Dangerous Heat in the Southern and Western U.S.

Severe weather and flooding threats will continue for portions of the central U.S. over the next couple of days, with multiple rounds of thunderstorms expected. Dangerous heat will persist across the southern and western U.S. through mid-week. Hot and dry conditions will fuel fire weather concerns for the Intermountain West, where dry thunderstorms may spark additional wildfires. Read More >

Current conditions at

Custer, Custer County Airport (KCUT)

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

Overcast

55°F

13°C

Humidity 83%
Wind Speed Calm
Barometer 30.31 in (1022.1 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 23 Jun 8:53 pm MDT
Extended Forecast for

Keystone SD

  • Tonight

    Tonight: Partly cloudy, with a low around 50. Light northwest wind.

    Low: 50 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A chance of showers between 9am and noon, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 66. Calm wind becoming east around 6 mph in the afternoon. Winds could gust as high as 17 mph. Chance of precipitation is 50%.

    High: 66 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Cloudy, then gradually becoming partly cloudy, with a low around 50. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.

    Low: 50 °F

    Chance
    Showers

  • Thursday

    Thursday: Showers likely, then showers and possibly a thunderstorm after noon. High near 62. Calm wind becoming southeast 5 to 8 mph in the morning. Winds could gust as high as 25 mph. Chance of precipitation is 80%.

    High: 62 °F

    Showers

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms between midnight and 3am, then a chance of showers after 3am. Low around 53. Southeast wind 5 to 7 mph becoming calm in the evening. Winds could gust as high as 22 mph. Chance of precipitation is 90%.

    Low: 53 °F

    Showers then
    Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 78. Calm wind becoming south 5 to 8 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 78 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 62.

    Low: 62 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 59.

    Low: 59 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 50. Light northwest wind.
Wednesday
A chance of showers between 9am and noon, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 66. Calm wind becoming east around 6 mph in the afternoon. Winds could gust as high as 17 mph. Chance of precipitation is 50%.
Wednesday Night
A chance of showers and thunderstorms. Cloudy, then gradually becoming partly cloudy, with a low around 50. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Thursday
Showers likely, then showers and possibly a thunderstorm after noon. High near 62. Calm wind becoming southeast 5 to 8 mph in the morning. Winds could gust as high as 25 mph. Chance of precipitation is 80%.
Thursday Night
Showers and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms between midnight and 3am, then a chance of showers after 3am. Low around 53. Southeast wind 5 to 7 mph becoming calm in the evening. Winds could gust as high as 22 mph. Chance of precipitation is 90%.
Friday
A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 78. Calm wind becoming south 5 to 8 mph in the afternoon. Winds could gust as high as 25 mph.
Friday Night
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 62.
Saturday
Mostly sunny, with a high near 86.
Saturday Night
A chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 59.
Sunday
A slight chance of showers and thunderstorms after noon. Sunny, with a high near 79.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 53.
Monday
A slight chance of showers. Mostly sunny, with a high near 77.
Monday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 54.
Tuesday
A slight chance of showers and thunderstorms. Sunny, with a high near 81.
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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:
9:02 pm MDT Jun 23, 2026
Forecast Valid:
9pm MDT Jun 23, 2026-6pm MDT Jun 30, 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