Coastal and Marine Impacts from Imelda and Humberto as Both Track Away from the Southeast U.S.

Swells and high surf from both Imelda and Humberto are expected to bring dangerous marine and rip current conditions to the east coast of Florida and Georgia today, spreading north along much of the east coast of the U.S. this week. Heavy rainfall north and west of Imelda falling across coastal Florida and Georgia into the Carolinas could cause isolated flash and urban flooding through Tuesday. Read More >

Hazardous Weather Conditions

Current conditions at

Custer, Custer County Airport (KCUT)

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

Fair

71°F

22°C

Humidity 41%
Wind Speed Vrbl 7 mph
Barometer 30.12 in (1014.0 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 29 Sep 5:53 pm MDT
Extended Forecast for

6 Miles NNW Keystone SD

  • Tonight

    Tonight: Isolated showers and thunderstorms before 7pm.  Mostly clear, with a low around 54. Southwest wind around 5 mph, with gusts as high as 18 mph.  Chance of precipitation is 20%.

    Low: 54 °F

    Isolated
    T-storms then
    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 81. Southwest wind 5 to 9 mph, with gusts as high as 25 mph.

    High: 81 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 55. South wind 5 to 7 mph, with gusts as high as 21 mph.

    Low: 55 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 77. West wind around 6 mph becoming light and variable  in the afternoon. Winds could gust as high as 21 mph.

    High: 77 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 53. Calm wind becoming southwest around 5 mph after midnight.

    Low: 53 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 81. Southwest wind 5 to 7 mph, with gusts as high as 21 mph.

    High: 81 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 53. Light and variable wind.

    Low: 53 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of showers after noon.  Mostly sunny, with a high near 71. Light and variable wind becoming north around 6 mph in the morning. Winds could gust as high as 20 mph.

    High: 71 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers.  Mostly cloudy, with a low around 44.

    Low: 44 °F

    Chance
    Showers

Detailed Forecast

Tonight
Isolated showers and thunderstorms before 7pm. Mostly clear, with a low around 54. Southwest wind around 5 mph, with gusts as high as 18 mph. Chance of precipitation is 20%.
Tuesday
Sunny, with a high near 81. Southwest wind 5 to 9 mph, with gusts as high as 25 mph.
Tuesday Night
Partly cloudy, with a low around 55. South wind 5 to 7 mph, with gusts as high as 21 mph.
Wednesday
Sunny, with a high near 77. West wind around 6 mph becoming light and variable in the afternoon. Winds could gust as high as 21 mph.
Wednesday Night
Mostly clear, with a low around 53. Calm wind becoming southwest around 5 mph after midnight.
Thursday
Sunny, with a high near 81. Southwest wind 5 to 7 mph, with gusts as high as 21 mph.
Thursday Night
Mostly clear, with a low around 53. Light and variable wind.
Friday
A slight chance of showers after noon. Mostly sunny, with a high near 71. Light and variable wind becoming north around 6 mph in the morning. Winds could gust as high as 20 mph.
Friday Night
A chance of showers. Mostly cloudy, with a low around 44.
Saturday
A slight chance of showers after noon. Mostly sunny, with a high near 66.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 43.
Sunday
A chance of showers. Partly sunny, with a high near 58.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 36.
Monday
A chance of showers. Mostly cloudy, with a high near 52.
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ABOUT THIS FORECAST

 
Point Forecast:
6 Miles NNW Keystone SD
 43.98°N 103.47°W (Elev. 4800 ft)
5:36 pm MDT Sep 29, 2025
6pm MDT Sep 29, 2025-6pm MDT Oct 6, 2025
 
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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