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: Mostly Cloudy 45°F 2025-10-12T18:55:00-06:00 
Tonight 2025-10-12, Clear then Frost. Widespread frost, mainly after 2am. Otherwise, clear, with a low around 29. Northwest wind 5 to 8 mph becoming calm in the evening. Winds could gust as high as 18 mph.
Columbus Day 2025-10-13, Frost then Mostly Sunny. Widespread frost before 9am. Otherwise, increasing clouds, with a high near 61. Light east wind becoming southeast 13 to 18 mph in the morning. Winds could gust as high as 25 mph.Monday Night 2025-10-13, Mostly Cloudy then Chance Showers. A 30 percent chance of showers after midnight. Mostly cloudy, with a low around 41. Southeast wind 13 to 18 mph, with gusts as high as 25 mph.
Tuesday 2025-10-14, Slight Chance Showers then Sunny. A 20 percent chance of showers before noon. Mostly cloudy, then gradually becoming sunny, with a high near 62. Southeast wind 11 to 13 mph, with gusts as high as 23 mph.
Tuesday Night 2025-10-14, Mostly Clear then Slight Chance Showers. A 20 percent chance of showers after midnight. Partly cloudy, with a low around 43. Southeast wind 6 to 13 mph, with gusts as high as 21 mph.
Wednesday 2025-10-15, Chance Showers. A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 66. East wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
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 17 mph. Chance of precipitation is 80%.
Thursday 2025-10-16, Showers Likely. Showers likely, mainly before noon. Partly sunny, with a high near 57. West wind 6 to 14 mph, with gusts as high as 23 mph.
Thursday Night 2025-10-16, Chance Showers. A chance of showers, mainly before midnight. Partly 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. Mostly cloudy, with a low around 37.- Saturday 2025-10-18, Slight Chance Showers. A slight chance of showers. Mostly sunny, with a high near 54.
Saturday Night 2025-10-18, Mostly Clear. Mostly clear, with a low around 37.
Sunday 2025-10-19, Sunny. Sunny, with a high near 63.