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

Spring Severe Thunderstorms and Late-Season Snow This Week

Scattered strong to severe thunderstorms may produce damaging winds, large hail, and a couple of tornadoes from east Texas through the lower Mississippi and Tennessee Valleys today and Wednesday. Late-season snow will continue over parts of the central Rockies including the Denver Metro into Wednesday. Read More >

Current conditions at

Custer, Custer County Airport (KCUT)

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

Overcast

37°F

3°C

Humidity 44%
Wind Speed SE 12 G 21 mph
Barometer 29.90 in (1013.5 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 5 May 2:53 pm MDT
Extended Forecast for

Keystone SD

  • This Afternoon

    This Afternoon: A 20 percent chance of snow showers. Mostly cloudy, with a high near 46. North wind around 10 mph, with gusts as high as 21 mph.

    High: 46 °F

    Slight Chance
    Snow Showers

  • Tonight

    Tonight: A 20 percent chance of snow showers before 8pm. Mostly cloudy, with a low around 26. North wind 3 to 8 mph. Winds could gust as high as 20 mph.

    Low: 26 °F

    Slight Chance
    Snow Showers
    then Partly
    Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 49. Light and variable wind becoming north around 5 mph in the afternoon. Winds could gust as high as 18 mph.

    High: 49 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 34. Calm wind becoming west around 6 mph after midnight. Winds could gust as high as 17 mph.

    Low: 34 °F

    Mostly Clear

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 66. Northwest wind 6 to 8 mph, with gusts as high as 25 mph.

    High: 66 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 44. Northwest wind around 7 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.

    Low: 44 °F

    Chance
    Showers then
    Mostly Cloudy

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 66. Northwest wind 6 to 11 mph, with gusts as high as 25 mph.

    High: 66 °F

    Mostly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 47. Northwest wind around 5 mph becoming calm in the evening. Winds could gust as high as 17 mph.

    Low: 47 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of showers, then showers and possibly a thunderstorm after noon. Mostly cloudy, with a high near 64.

    High: 64 °F

    Showers

Detailed Forecast

This Afternoon
A 20 percent chance of snow showers. Mostly cloudy, with a high near 46. North wind around 10 mph, with gusts as high as 21 mph.
Tonight
A 20 percent chance of snow showers before 8pm. Mostly cloudy, with a low around 26. North wind 3 to 8 mph. Winds could gust as high as 20 mph.
Wednesday
Mostly sunny, with a high near 49. Light and variable wind becoming north around 5 mph in the afternoon. Winds could gust as high as 18 mph.
Wednesday Night
Mostly clear, with a low around 34. Calm wind becoming west around 6 mph after midnight. Winds could gust as high as 17 mph.
Thursday
A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 66. Northwest wind 6 to 8 mph, with gusts as high as 25 mph.
Thursday Night
A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 44. Northwest wind around 7 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.
Friday
A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 66. Northwest wind 6 to 11 mph, with gusts as high as 25 mph.
Friday Night
Mostly cloudy, with a low around 47. Northwest wind around 5 mph becoming calm in the evening. Winds could gust as high as 17 mph.
Saturday
A chance of showers, then showers and possibly a thunderstorm after noon. Mostly cloudy, with a high near 64.
Saturday Night
A slight chance of showers before midnight. Mostly cloudy, with a low around 40.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 63.
Sunday Night
Mostly clear, with a low around 42.
Monday
Sunny, with a high near 76.
Monday Night
Partly cloudy, with a low around 51.
Tuesday
Mostly 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:
2:22 pm MDT May 5, 2026
Forecast Valid:
3pm MDT May 5, 2026-6pm MDT May 12, 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