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

Typhoon Sinlaku to Impact the Marianas and Guam; Severe Weather from the Southern Plains to the Great Lakes

Typhoon Sinlaku will bring destructive winds, widespread heavy rain/flooding, thunderstorms, and coastal impacts to the Marianas Islands into Wednesday. Typhoon conditions are likely over CNMI and tropical storm conditions over Guam. Severe thunderstorms and heavy rain are expected from the Southern Plains to the Great Lakes today. Read More >

Current conditions at

Spearfish / Clyde Ice (KSPF)

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

A Few Clouds

55°F

13°C

Humidity 38%
Wind Speed Vrbl 5 G 16 mph
Barometer 29.79 in
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill54°F (12°C)
Last update 14 Apr 3:35 pm MDT
Extended Forecast for

Spearfish SD

  • This Afternoon

    This Afternoon: A 30 percent chance of showers, mainly after 4pm. Mostly cloudy, with a high near 62. Southwest wind around 6 mph.

    High: 62 °F

    Chance
    Showers

  • Tonight

    Tonight: A 20 percent chance of showers before 8pm. Mostly clear, with a low around 42. South wind 3 to 6 mph.

    Low: 42 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 71. South wind around 6 mph becoming northwest in the afternoon. Winds could gust as high as 15 mph.

    High: 71 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 51. West wind 6 to 16 mph becoming south in the evening. Winds could gust as high as 28 mph.

    Low: 51 °F

    Mostly Clear

  • Thursday

    Thursday: Showers likely after noon. Increasing clouds, with a high near 66. Breezy, with a southwest wind 15 to 20 mph becoming northwest in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 60%.

    High: 66 °F

    Mostly Sunny
    and Breezy
    then Showers
    Likely

  • Thursday Night

    Thursday Night: Rain showers before 11pm, then rain and snow showers between 11pm and midnight, then snow showers after midnight. Low around 27. Northwest wind around 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    Low: 27 °F

    Rain/Snow
    then Snow
    Showers

  • Friday

    Friday: Snow showers likely, mainly before noon. Mostly cloudy, with a high near 38. Breezy, with a northwest wind 14 to 21 mph, with gusts as high as 34 mph. Chance of precipitation is 70%.

    High: 38 °F

    Snow Showers
    Likely and
    Breezy

  • Friday Night

    Friday Night: A slight chance of snow showers before midnight. Mostly cloudy, with a low around 24. Blustery, with a west wind 13 to 21 mph, with gusts as high as 33 mph.

    Low: 24 °F

    Slight Chance
    Snow Showers
    and Blustery
    then Partly
    Cloudy

  • Saturday

    Saturday: A chance of snow showers, mainly after noon. Mostly sunny, with a high near 45. Breezy.

    High: 45 °F

    Chance Snow
    Showers and
    Breezy

Detailed Forecast

This Afternoon
A 30 percent chance of showers, mainly after 4pm. Mostly cloudy, with a high near 62. Southwest wind around 6 mph.
Tonight
A 20 percent chance of showers before 8pm. Mostly clear, with a low around 42. South wind 3 to 6 mph.
Wednesday
Sunny, with a high near 71. South wind around 6 mph becoming northwest in the afternoon. Winds could gust as high as 15 mph.
Wednesday Night
Mostly clear, with a low around 51. West wind 6 to 16 mph becoming south in the evening. Winds could gust as high as 28 mph.
Thursday
Showers likely after noon. Increasing clouds, with a high near 66. Breezy, with a southwest wind 15 to 20 mph becoming northwest in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 60%.
Thursday Night
Rain showers before 11pm, then rain and snow showers between 11pm and midnight, then snow showers after midnight. Low around 27. Northwest wind around 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Friday
Snow showers likely, mainly before noon. Mostly cloudy, with a high near 38. Breezy, with a northwest wind 14 to 21 mph, with gusts as high as 34 mph. Chance of precipitation is 70%.
Friday Night
A slight chance of snow showers before midnight. Mostly cloudy, with a low around 24. Blustery, with a west wind 13 to 21 mph, with gusts as high as 33 mph.
Saturday
A chance of snow showers, mainly after noon. Mostly sunny, with a high near 45. Breezy.
Saturday Night
Mostly clear, with a low around 29.
Sunday
Sunny, with a high near 63.
Sunday Night
Mostly clear, with a low around 39.
Monday
Sunny, with a high near 74.
Monday Night
Partly cloudy, with a low around 49.
Tuesday
A slight chance of showers. Mostly sunny, with a high near 75.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Spearfish SD
 44.48°N 103.85°W (Elev. 3780 ft)
Last Update:
2:02 pm MDT Apr 14, 2026
Forecast Valid:
3pm MDT Apr 14, 2026-6pm MDT Apr 21, 2026
 
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