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

Record Heat for the Intermountain West and Northern Plains; Heavy Rainfall and Severe Weather Threats

Record setting heat is expected over the next several days from the Intermountain West through the northern Plains. Furthermore, fire weather concerns increase with dry and breezy conditions. Meanwhile, heavy rainfall and severe thunderstorm threats for the Ohio/Tennessee Valleys, central Appalachians and Southeast today. The threat shifts to central Gulf Coast and across central Texas this week. Read More >

Current conditions at

Custer, Custer County Airport (KCUT)

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

Fair

80°F

27°C

Humidity 37%
Wind Speed S 9 G 20 mph
Barometer 30.27 in (1016.3 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 13 Jul 9:53 am MDT
Extended Forecast for

Keystone SD

  • Today

    Today: Sunny, with a high near 98. South wind around 9 mph, with gusts as high as 26 mph.

    High: 98 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 72. South wind 5 to 8 mph becoming southwest after midnight. Winds could gust as high as 24 mph.

    Low: 72 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 97. Light and variable wind becoming southeast 5 to 9 mph in the morning. Winds could gust as high as 24 mph.

    High: 97 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 70. Southeast wind 6 to 8 mph becoming southwest after midnight. Winds could gust as high as 25 mph.

    Low: 70 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 95. South wind 6 to 10 mph, with gusts as high as 29 mph.

    High: 95 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 70. South wind 5 to 9 mph becoming southwest after midnight. Winds could gust as high as 28 mph.

    Low: 70 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Thursday Night

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

    Low: 69 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of showers and thunderstorms after noon. Sunny, with a high near 93.

    High: 93 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 98. South wind around 9 mph, with gusts as high as 26 mph.
Tonight
Mostly clear, with a low around 72. South wind 5 to 8 mph becoming southwest after midnight. Winds could gust as high as 24 mph.
Tuesday
Sunny, with a high near 97. Light and variable wind becoming southeast 5 to 9 mph in the morning. Winds could gust as high as 24 mph.
Tuesday Night
Mostly clear, with a low around 70. Southeast wind 6 to 8 mph becoming southwest after midnight. Winds could gust as high as 25 mph.
Wednesday
Sunny, with a high near 95. South wind 6 to 10 mph, with gusts as high as 29 mph.
Wednesday Night
Mostly clear, with a low around 70. South wind 5 to 9 mph becoming southwest after midnight. Winds could gust as high as 28 mph.
Thursday
Sunny, with a high near 94.
Thursday Night
Mostly clear, with a low around 69.
Friday
A slight chance of showers and thunderstorms after noon. Sunny, with a high near 93.
Friday Night
Partly cloudy, with a low around 69.
Saturday
Mostly sunny, with a high near 91.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Sunday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 90.
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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 am MDT Jul 13, 2026
Forecast Valid:
10am MDT Jul 13, 2026-6pm MDT Jul 19, 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