Excessive Rainfall in the Southern Plains, Ozarks, and Upper Midwest Thursday

Heavy thunderstorms will continue areas of excessive rainfall and locally considerable flooding over parts of the southern Plains into the mid-Mississippi River Valley through Friday. Heavy to excessive rainfall may bring flash and urban flooding, along with isolated riverine flooding to a part of the Upper Midwest Thursday. Read More >

Hazardous Weather Conditions

Current conditions at

Custer, Custer County Airport (KCUT)

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

Fair

57°F

14°C

Humidity 87%
Wind Speed N 3 mph
Barometer 30.00 in (1010.0 mb)
Dewpoint 53°F (12°C)
Visibility 9.00 mi
Last update 12 Jun 6:53 am MDT
Extended Forecast for

Keystone SD

  • Today

    Today: A slight chance of showers between 4pm and 5pm, then a slight chance of showers and thunderstorms after 5pm.  Patchy fog before 9am.  Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 67. Calm wind becoming east around 5 mph in the morning. Winds could gust as high as 15 mph.  Chance of precipitation is 20%.

    High: 67 °F

    Patchy Fog
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly between midnight and 3am.  Mostly cloudy, with a low around 56. East wind around 5 mph becoming calm  in the evening.

    Low: 56 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms after noon. Some of the storms could be severe.  Partly sunny, with a high near 73. Calm wind becoming east around 5 mph in the morning. Winds could gust as high as 20 mph.

    High: 73 °F

    Partly Sunny
    then Severe
    Thunderstorms

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms before midnight. Some of the storms could be severe.  Mostly cloudy, with a low around 58. Southeast wind around 5 mph becoming calm  in the evening. Winds could gust as high as 15 mph.

    Low: 58 °F

    Severe
    Thunderstorms
    then Mostly
    Cloudy

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms after noon.  Mostly sunny, with a high near 83. Calm wind becoming southeast around 5 mph in the morning. Winds could gust as high as 20 mph.

    High: 83 °F

    Mostly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms before midnight.  Mostly cloudy, with a low around 59. East wind around 5 mph becoming calm  in the evening. Winds could gust as high as 15 mph.

    Low: 59 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms after noon.  Mostly sunny, with a high near 83. Calm wind becoming east around 5 mph in the morning. Winds could gust as high as 20 mph.

    High: 83 °F

    Mostly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, mainly before midnight.  Partly cloudy, with a low around 61. Southeast wind around 5 mph becoming west after midnight. Winds could gust as high as 15 mph.

    Low: 61 °F

    Chance
    T-storms

  • Monday

    Monday: A chance of showers and thunderstorms after noon.  Partly sunny, with a high near 81.

    High: 81 °F

    Partly Sunny
    then Chance
    T-storms

Detailed Forecast

Today
A slight chance of showers between 4pm and 5pm, then a slight chance of showers and thunderstorms after 5pm. Patchy fog before 9am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 67. Calm wind becoming east around 5 mph in the morning. Winds could gust as high as 15 mph. Chance of precipitation is 20%.
Tonight
A 30 percent chance of showers and thunderstorms, mainly between midnight and 3am. Mostly cloudy, with a low around 56. East wind around 5 mph becoming calm in the evening.
Friday
A 40 percent chance of showers and thunderstorms after noon. Some of the storms could be severe. Partly sunny, with a high near 73. Calm wind becoming east around 5 mph in the morning. Winds could gust as high as 20 mph.
Friday Night
A 40 percent chance of showers and thunderstorms before midnight. Some of the storms could be severe. Mostly cloudy, with a low around 58. Southeast wind around 5 mph becoming calm in the evening. Winds could gust as high as 15 mph.
Saturday
A 40 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 83. Calm wind becoming southeast around 5 mph in the morning. Winds could gust as high as 20 mph.
Saturday Night
A 40 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 59. East wind around 5 mph becoming calm in the evening. Winds could gust as high as 15 mph.
Sunday
A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 83. Calm wind becoming east around 5 mph in the morning. Winds could gust as high as 20 mph.
Sunday Night
A chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 61. Southeast wind around 5 mph becoming west after midnight. Winds could gust as high as 15 mph.
Monday
A chance of showers and thunderstorms after noon. Partly sunny, with a high near 81.
Monday Night
Showers and thunderstorms likely, mainly before midnight. Mostly cloudy, with a low around 57.
Tuesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 73.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 55.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 76.
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ABOUT THIS FORECAST

 
Point Forecast:
Keystone SD
 43.89°N 103.43°W (Elev. 4541 ft)
5:49 am MDT Jun 12, 2025
7am MDT Jun 12, 2025-6pm MDT Jun 18, 2025
 
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Additional Resources

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