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

Dangerous Heat in the West; Coastal Flooding & High Rip Current Risk through the Weekend on the East Coast; Flash Flooding Concerns in the Southeast and Southwest

A dangerous, record heat wave continues across portions of the West through Tuesday. High rip current risk and dangerous surf continue through the weekend. There are flash flooding concerns through the weekend for portions of the Southeast and Southwest. Read More >

Current conditions at

Custer, Custer County Airport (KCUT)

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

Overcast

61°F

16°C

Humidity 67%
Wind Speed SE 6 mph
Barometer 30.38 in (1024.1 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 23 Aug 11:53 am MDT
Extended Forecast for

Keystone SD

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 71. Southeast wind around 5 mph.

    High: 71 °F

    Partly Sunny

  • Tonight

    Tonight: A slight chance of showers and thunderstorms between midnight and 3am. Partly cloudy, with a low around 52. Southeast wind around 5 mph becoming calm. Chance of precipitation is 20%.

    Low: 52 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 70. Calm wind becoming east around 5 mph in the morning. Winds could gust as high as 20 mph.

    High: 70 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 50. East wind around 5 mph becoming calm in the evening. Winds could gust as high as 15 mph.

    Low: 50 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 71. Calm wind becoming southeast around 5 mph in the morning. Winds could gust as high as 20 mph.

    High: 71 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 53. Southeast wind around 5 mph becoming calm in the evening. Winds could gust as high as 15 mph.

    Low: 53 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 75. Calm wind becoming southeast around 5 mph in the morning. Winds could gust as high as 20 mph.

    High: 75 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 56. Southeast wind around 5 mph becoming southwest after midnight. Winds could gust as high as 15 mph.

    Low: 56 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms after noon. Partly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

This Afternoon
Partly sunny, with a high near 71. Southeast wind around 5 mph.
Tonight
A slight chance of showers and thunderstorms between midnight and 3am. Partly cloudy, with a low around 52. Southeast wind around 5 mph becoming calm. Chance of precipitation is 20%.
Sunday
Mostly sunny, with a high near 70. Calm wind becoming east around 5 mph in the morning. Winds could gust as high as 20 mph.
Sunday Night
Partly cloudy, with a low around 50. East wind around 5 mph becoming calm in the evening. Winds could gust as high as 15 mph.
Monday
A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 71. Calm wind becoming southeast around 5 mph in the morning. Winds could gust as high as 20 mph.
Monday Night
Partly cloudy, with a low around 53. Southeast wind around 5 mph becoming calm in the evening. Winds could gust as high as 15 mph.
Tuesday
Mostly sunny, with a high near 75. Calm wind becoming southeast around 5 mph in the morning. Winds could gust as high as 20 mph.
Tuesday Night
Partly cloudy, with a low around 56. Southeast wind around 5 mph becoming southwest after midnight. Winds could gust as high as 15 mph.
Wednesday
A slight chance of showers and thunderstorms after noon. Partly sunny, with a high near 78.
Wednesday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 57.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 75.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 56.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 74.
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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:
9:29 am MDT Aug 23, 2025
Forecast Valid:
12pm MDT Aug 23, 2025-6pm MDT Aug 29, 2025
 
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