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: Fog 45°F 2025-10-15T01:15:00-06:00 
Overnight 2025-10-15, Patchy Drizzle and Dense Fog. Patchy drizzle. Widespread dense fog. Otherwise, mostly cloudy, with a low around 43. Calm wind becoming east 5 to 7 mph.
Wednesday 2025-10-15, Patchy Drizzle and Dense Fog. Patchy drizzle with a slight chance of showers before noon, then a slight chance of showers after 3pm. Widespread dense fog, mainly before 9am. Otherwise, cloudy, with a high near 57. East wind 8 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
Wednesday Night 2025-10-15, Showers. Showers and possibly a thunderstorm. Low around 46. East wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 90%.
Thursday 2025-10-16, Showers. Showers. High near 54. West wind 7 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.
Thursday Night 2025-10-16, Chance Showers. A 30 percent chance of showers. Mostly cloudy, with a low around 41. West wind around 14 mph, with gusts as high as 24 mph.Friday 2025-10-17, Breezy. Chance Showers then Mostly Sunny. A 30 percent chance of showers before noon. Mostly sunny, with a high near 55. Breezy, with a west wind 14 to 20 mph, with gusts as high as 30 mph.
Friday Night 2025-10-17, Partly Cloudy then Slight Chance Showers. A 20 percent chance of showers after midnight. Partly cloudy, with a low around 38. West wind around 15 mph, with gusts as high as 26 mph.
Saturday 2025-10-18, Breezy. Slight Chance Showers then Mostly Sunny. A slight chance of showers before noon. Mostly sunny, with a high near 50. Breezy, with a northwest wind 13 to 20 mph, with gusts as high as 32 mph.
Saturday Night 2025-10-18, Mostly Clear. Mostly clear, with a low around 38.
Sunday 2025-10-19, Sunny. Sunny, with a high near 67.Sunday Night 2025-10-19, Partly Cloudy then Slight Chance Showers. A slight chance of showers. Partly cloudy, with a low around 44.
Monday 2025-10-20, Slight Chance Showers. A slight chance of showers. Mostly sunny, with a high near 59.Monday Night 2025-10-20, Chance Showers then Chance Rain/Snow. A chance of rain and snow showers. Mostly cloudy, with a low around 37.
Tuesday 2025-10-21, Chance Rain/Snow then Chance Showers. A chance of rain and snow showers. Partly sunny, with a high near 49.