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Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Hazardous Weather Conditions

Current conditions at

Spearfish / Clyde Ice (KSPF)

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

Fair

86°F

30°C

Humidity 40%
Wind Speed NW 6 mph
Barometer 30.01 in
Dewpoint 59°F (15°C)
Visibility 9.00 mi
Heat Index85°F (29°C)
Last update 17 Aug 1:55 pm MDT
Extended Forecast for

2 Miles SE Saint Onge SD

  • This Afternoon

    This Afternoon: A 20 percent chance of showers and thunderstorms before 4pm. Sunny, with a high near 85. North wind around 10 mph becoming southeast.

    High: 85 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 63. South wind 5 to 10 mph becoming west after midnight.

    Low: 63 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 85. Southwest wind 5 to 10 mph becoming northeast in the morning. Winds could gust as high as 15 mph.

    High: 85 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 64. East wind 5 to 10 mph becoming southwest after midnight.

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 89. Southwest wind 5 to 15 mph becoming east in the morning. Winds could gust as high as 20 mph.

    High: 89 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 68. South wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 68 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 94. Southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 94 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 70. Southeast wind 10 to 15 mph becoming southwest after midnight. Winds could gust as high as 25 mph.

    Low: 70 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms before 4pm. Sunny, with a high near 85. North wind around 10 mph becoming southeast.
Tonight
Partly cloudy, with a low around 63. South wind 5 to 10 mph becoming west after midnight.
Monday
A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 85. Southwest wind 5 to 10 mph becoming northeast in the morning. Winds could gust as high as 15 mph.
Monday Night
Mostly clear, with a low around 64. East wind 5 to 10 mph becoming southwest after midnight.
Tuesday
Sunny, with a high near 89. Southwest wind 5 to 15 mph becoming east in the morning. Winds could gust as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 68. South wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 94. Southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 70. Southeast wind 10 to 15 mph becoming southwest after midnight. Winds could gust as high as 25 mph.
Thursday
Sunny, with a high near 86.
Thursday Night
A chance of showers after midnight. Partly cloudy, with a low around 60.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 75.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 55.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 73.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SE Saint Onge SD
 44.53°N 103.73°W (Elev. 3533 ft)
Last Update:
12:29 pm MDT Aug 17, 2025
Forecast Valid:
2pm MDT Aug 17, 2025-6pm MDT Aug 23, 2025
 
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Additional Resources

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Chance of Precipitation