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

Heat in the Central U.S.; Heavy Rain Possible for South Texas; Monitoring Erin Tropical Impacts

Hot temperatures are forecast over the Plains and into the lower Mississippi River Valley Friday where Heat Advisories have been issued. Heavy rain from a disturbance in the western Gulf could bring flooding to south Texas. Erin could bring tropical storm conditions and heavy rain to Puerto Rico and the USVI this weekend with dangerous surf and rip currents impacting the western Atlantic Basin. Read More >

Hazardous Weather Conditions

Current conditions at

Spearfish / Clyde Ice (KSPF)

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

Fair

59°F

15°C

Humidity 94%
Wind Speed W 5 mph
Barometer 29.99 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 15 Aug 4:55 am MDT
Extended Forecast for

Nisland SD

  • Today

    Today: A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 85. East wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 85 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before midnight, then a slight chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 65. East wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    Low: 65 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly after noon. Partly sunny, with a high near 83. East wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 83 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 63. East wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 63 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 86. East wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 86 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 62. East wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 86. South wind 5 to 15 mph becoming east in the afternoon. Winds could gust as high as 20 mph.

    High: 86 °F

    Sunny

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms before midnight. Mostly clear, with a low around 62. East wind 5 to 15 mph becoming southwest after midnight. Winds could gust as high as 20 mph.

    Low: 62 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 85. East wind 5 to 15 mph, with gusts as high as 25 mph.
Tonight
A slight chance of showers and thunderstorms before midnight, then a slight chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 65. East wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Saturday
A 30 percent chance of showers and thunderstorms, mainly after noon. Partly sunny, with a high near 83. East wind 5 to 15 mph, with gusts as high as 25 mph.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 63. East wind 5 to 15 mph, with gusts as high as 25 mph.
Sunday
A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 86. East wind 5 to 15 mph, with gusts as high as 20 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 62. East wind 5 to 15 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 86. South wind 5 to 15 mph becoming east in the afternoon. Winds could gust as high as 20 mph.
Monday Night
A slight chance of showers and thunderstorms before midnight. Mostly clear, with a low around 62. East wind 5 to 15 mph becoming southwest after midnight. Winds could gust as high as 20 mph.
Tuesday
Sunny, with a high near 89.
Tuesday Night
Mostly clear, with a low around 64.
Wednesday
Sunny, with a high near 91.
Wednesday Night
Mostly clear, with a low around 64.
Thursday
Sunny, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Nisland SD
 44.66°N 103.56°W (Elev. 2897 ft)
Last Update:
4:09 am MDT Aug 15, 2025
Forecast Valid:
5am MDT Aug 15, 2025-6pm MDT Aug 21, 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