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 36°F 2025-10-12T22:15:00-06:00 
Tonight 2025-10-12, Mostly Clear then Frost. Widespread frost, mainly after 2am. Otherwise, mostly clear, with a low around 31. Light and variable wind.
Columbus Day 2025-10-13, Frost then Mostly Sunny. Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 58. East wind 5 to 10 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 26 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 42. Southeast wind 14 to 18 mph, with gusts as high as 25 mph.
Tuesday 2025-10-14, Chance Showers then Sunny. A 30 percent chance of showers before noon. Mostly cloudy, then gradually becoming sunny, with a high near 60. Southeast wind around 14 mph, with gusts as high as 26 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 44. Southeast wind 7 to 11 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 64. East wind 7 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Wednesday Night 2025-10-15, Showers Likely. Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 45. East wind 6 to 9 mph becoming west after midnight. Winds could gust as high as 17 mph. Chance of precipitation is 70%.
Thursday 2025-10-16, Showers Likely. Showers likely, mainly before noon. Partly sunny, with a high near 55. West wind 7 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 41.
Friday 2025-10-17, Chance Showers. A chance of showers, mainly before noon. Mostly sunny, with a high near 56.
Friday Night 2025-10-17, Chance Showers. A chance of showers. Mostly cloudy, with a low around 38.- Saturday 2025-10-18, Slight Chance Showers. A slight chance of showers. Mostly sunny, with a high near 52.
- Saturday Night 2025-10-18, Mostly Clear. Mostly clear, with a low around 39.
- Sunday 2025-10-19, Sunny. Sunny, with a high near 61.