I-90 weather conditions near Spearfish, South Dakota
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Seasoned Weather Conditions
Current Weather Conditions
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7 day weather forecast
Current condition: Fair 68°F 2025-08-28T08:35:00-06:00
Today 2025-08-28, Slight Chance T-storms then Chance T-storms. A slight chance of showers, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 74. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.
Tonight 2025-08-28, Chance T-storms then Chance Showers. A 50 percent chance of showers and thunderstorms. Cloudy, with a low around 57. Southeast wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 15 mph.
Friday 2025-08-29, Showers. Showers and possibly a thunderstorm. High near 70. Light and variable wind becoming north 5 to 10 mph in the morning. Chance of precipitation is 80%.
Friday Night 2025-08-29, Showers Likely. Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 56. North wind around 5 mph becoming south in the evening. Chance of precipitation is 60%.
Saturday 2025-08-30, Showers Likely. A chance of showers before 9am, then a chance of showers and thunderstorms between 9am and noon, then showers likely and possibly a thunderstorm after noon. Mostly cloudy, with a high near 68. West wind 5 to 10 mph becoming northeast in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 60%.
Saturday Night 2025-08-30, Chance Showers then Partly Cloudy. A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 53. Northeast wind around 5 mph becoming southwest after midnight. Chance of precipitation is 30%.
Sunday 2025-08-31, Sunny. Sunny, with a high near 74. Southwest wind 5 to 10 mph becoming northeast in the afternoon. Winds could gust as high as 15 mph.
Sunday Night 2025-08-31, Mostly Clear. Mostly clear, with a low around 55. Northeast wind around 5 mph becoming southwest after midnight.
Labor Day 2025-09-01, Sunny. Sunny, with a high near 78.
Monday Night 2025-09-01, Mostly Clear. Mostly clear, with a low around 58.
Tuesday 2025-09-02, Sunny. Sunny, with a high near 80.
Tuesday Night 2025-09-02, Slight Chance T-storms then Slight Chance Showers. A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 52.
Wednesday 2025-09-03, Partly Sunny. Partly sunny, with a high near 66.