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

Erin Strengthens to a Hurricane; Heavy Rainfall Possible in Puerto Rico and the Virgin Islands, the Upper Midwest, South Texas

Hurricane Erin may bring isolated flash and urban flooding, landslides or mudslides, and possible tropical storm conditions to Puerto Rico and the U.S. Virgin Islands this weekend. Scattered thunderstorms and heavy rainfall may bring areas of flooding this weekend over the Upper Midwest. A tropical disturbance will bring locally heavy rain and mainly urban flash flooding to far southern Texas. Read More >

Hazardous Weather Conditions

Current conditions at

Spearfish / Clyde Ice (KSPF)

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

Fair

75°F

24°C

Humidity 74%
Wind Speed Calm
Barometer 30.02 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 16 Aug 11:35 am MDT
Extended Forecast for

Lead SD

  • Today

    Today: A 50 percent chance of showers and thunderstorms, mainly after 2pm. Some of the storms could be severe. Mostly cloudy, with a steady temperature around 73. Calm wind becoming southeast around 5 mph in the afternoon. Winds could gust as high as 15 mph.

    High: 73 °F

    Severe
    Thunderstorms

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 59. Southeast wind around 5 mph becoming southwest after midnight. Winds could gust as high as 15 mph.

    Low: 59 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms after noon. Sunny, with a high near 82. Calm wind becoming north around 5 mph in the afternoon. Winds could gust as high as 15 mph.

    High: 82 °F

    Sunny then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before midnight. Mostly clear, with a low around 59. East wind around 5 mph becoming calm in the evening.

    Low: 59 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after noon. Sunny, with a high near 81. Calm wind becoming east around 5 mph in the morning. Winds could gust as high as 15 mph.

    High: 81 °F

    Sunny then
    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 58. East wind around 5 mph becoming calm after midnight.

    Low: 58 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 83. Calm wind becoming east around 5 mph in the afternoon. Winds could gust as high as 15 mph.

    High: 83 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 61. Southeast wind around 5 mph becoming south after midnight. Winds could gust as high as 15 mph.

    Low: 61 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

Detailed Forecast

Today
A 50 percent chance of showers and thunderstorms, mainly after 2pm. Some of the storms could be severe. Mostly cloudy, with a steady temperature around 73. Calm wind becoming southeast around 5 mph in the afternoon. Winds could gust as high as 15 mph.
Tonight
A 40 percent chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 59. Southeast wind around 5 mph becoming southwest after midnight. Winds could gust as high as 15 mph.
Sunday
A 30 percent chance of showers and thunderstorms after noon. Sunny, with a high near 82. Calm wind becoming north around 5 mph in the afternoon. Winds could gust as high as 15 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms before midnight. Mostly clear, with a low around 59. East wind around 5 mph becoming calm in the evening.
Monday
A 30 percent chance of showers and thunderstorms after noon. Sunny, with a high near 81. Calm wind becoming east around 5 mph in the morning. Winds could gust as high as 15 mph.
Monday Night
Mostly clear, with a low around 58. East wind around 5 mph becoming calm after midnight.
Tuesday
Sunny, with a high near 83. Calm wind becoming east around 5 mph in the afternoon. Winds could gust as high as 15 mph.
Tuesday Night
Mostly clear, with a low around 61. Southeast wind around 5 mph becoming south after midnight. Winds could gust as high as 15 mph.
Wednesday
Sunny, with a high near 88.
Wednesday Night
Mostly clear, with a low around 65.
Thursday
Sunny, with a high near 84.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 56.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 72.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lead SD
 44.33°N 103.74°W (Elev. 5518 ft)
Last Update:
11:30 am MDT Aug 16, 2025
Forecast Valid:
11am MDT Aug 16, 2025-6pm MDT Aug 22, 2025
 
Forecast Discussion
 
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Additional Resources

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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