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 30°F 2025-10-13T02:15:00-06:00 
Overnight 2025-10-13, Frost. Widespread frost. Otherwise, clear, with a low around 30. Light east wind.
Columbus Day 2025-10-13, Frost then Mostly Sunny. Widespread frost, mainly before 8am. Otherwise, mostly sunny, with a high near 57. East wind 5 to 10 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 30 mph.Monday Night 2025-10-13, Mostly Cloudy and Breezy then Slight Chance Showers. A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 42. Breezy, with an east wind 15 to 20 mph, with gusts as high as 32 mph.
Tuesday 2025-10-14, Chance Showers then Sunny. A 30 percent chance of showers before noon. Cloudy through mid morning, then gradual clearing, with a high near 62. Southeast wind 11 to 14 mph, with gusts as high as 22 mph.
Tuesday Night 2025-10-14, Partly Cloudy then Chance Showers. A 30 percent chance of showers after midnight. Partly cloudy, with a low around 43. Southeast wind 6 to 13 mph, with gusts as high as 22 mph.
Wednesday 2025-10-15, Chance Showers. A 50 percent chance of showers. Mostly sunny, with a high near 63. East wind 6 to 10 mph, with gusts as high as 18 mph.
Wednesday Night 2025-10-15, Showers. Showers likely and possibly a thunderstorm, then showers after midnight. Low around 45. East wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 80%.
Thursday 2025-10-16, Showers Likely. Showers likely, mainly before noon. Mostly cloudy, with a high near 55. West wind 7 to 14 mph, with gusts as high as 24 mph.
Thursday Night 2025-10-16, Chance Showers. A chance of showers. Mostly cloudy, with a low around 40.
Friday 2025-10-17, Chance Showers. A chance of showers, mainly before noon. Mostly sunny, with a high near 58.
Friday Night 2025-10-17, Chance Showers. A chance of showers. Partly cloudy, with a low around 38.- Saturday 2025-10-18, Slight Chance Showers and Breezy. A slight chance of showers. Mostly sunny, with a high near 53. Breezy.
Saturday Night 2025-10-18, Mostly Clear. Mostly clear, with a low around 37.
Sunday 2025-10-19, Sunny. Sunny, with a high near 64.