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

Spearfish / Clyde Ice (KSPF)

Lat: 44.48°NLon: 103.78°WElev: 3898ft.

Mostly Cloudy

66°F

19°C

Humidity 83%
Wind Speed SE 8 mph
Barometer 30.00 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 29 Sep 5:35 pm MDT
Extended Forecast for

Nisland SD

  • This Afternoon

    This Afternoon: Isolated showers and thunderstorms.  Partly sunny, with a steady temperature around 76. East wind around 9 mph, with gusts as high as 18 mph.  Chance of precipitation is 20%.

    High: 76 °F

    Isolated
    T-storms

  • Tonight

    Tonight: Isolated showers and thunderstorms before 7pm.  Partly cloudy, with a low around 56. Southeast wind 8 to 13 mph, with gusts as high as 20 mph.  Chance of precipitation is 20%.

    Low: 56 °F

    Isolated
    T-storms then
    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 88. Southeast wind 8 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 23 mph.

    High: 88 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 59. South wind 11 to 14 mph, with gusts as high as 23 mph.

    Low: 59 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 81. West wind 7 to 15 mph becoming north in the afternoon. Winds could gust as high as 22 mph.

    High: 81 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 53. North wind around 7 mph becoming south in the evening.

    Low: 53 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 85. South wind 7 to 11 mph becoming north in the afternoon. Winds could gust as high as 18 mph.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 53. North wind around 9 mph becoming west after midnight. Winds could gust as high as 16 mph.

    Low: 53 °F

    Partly Cloudy

  • Friday

    Friday: A slight chance of showers.  Partly sunny, with a high near 71.

    High: 71 °F

    Slight Chance
    Showers

Detailed Forecast

This Afternoon
Isolated showers and thunderstorms. Partly sunny, with a steady temperature around 76. East wind around 9 mph, with gusts as high as 18 mph. Chance of precipitation is 20%.
Tonight
Isolated showers and thunderstorms before 7pm. Partly cloudy, with a low around 56. Southeast wind 8 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Tuesday
Sunny, with a high near 88. Southeast wind 8 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 23 mph.
Tuesday Night
Partly cloudy, with a low around 59. South wind 11 to 14 mph, with gusts as high as 23 mph.
Wednesday
Sunny, with a high near 81. West wind 7 to 15 mph becoming north in the afternoon. Winds could gust as high as 22 mph.
Wednesday Night
Mostly clear, with a low around 53. North wind around 7 mph becoming south in the evening.
Thursday
Sunny, with a high near 85. South wind 7 to 11 mph becoming north in the afternoon. Winds could gust as high as 18 mph.
Thursday Night
Partly cloudy, with a low around 53. North wind around 9 mph becoming west after midnight. Winds could gust as high as 16 mph.
Friday
A slight chance of showers. Partly sunny, with a high near 71.
Friday Night
A chance of showers. Mostly cloudy, with a low around 45.
Saturday
A slight chance of showers. Mostly sunny, with a high near 69.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 45.
Sunday
A chance of showers. Partly sunny, with a high near 61.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 40.
Monday
A chance of showers. Mostly cloudy, with a high near 56.
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ABOUT THIS FORECAST

 
Point Forecast:
Nisland SD
 44.66°N 103.56°W (Elev. 2897 ft)
5:36 pm MDT Sep 29, 2025
5pm 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