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: Overcast 45°F 2025-10-14T21:55:00-06:00 Tonight 2025-10-14, Patchy Fog then Chance Drizzle and Areas Fog. A chance of drizzle between midnight and 3am. Patchy fog. Otherwise, increasing clouds, with a low around 43. East wind 3 to 6 mph.
Wednesday 2025-10-15, Slight Chance Showers and Areas Fog. A slight chance of showers before noon, then a slight chance of showers after 3pm. Areas of fog before noon. Otherwise, cloudy, with a high near 57. East wind 6 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 45. East wind 5 to 10 mph becoming light and variable. 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 40. 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 31 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 14 to 21 mph, with gusts as high as 32 mph.
Saturday Night 2025-10-18, Mostly Clear. Mostly clear, with a low around 37.
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 43.
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 Showers. A chance of showers. Partly sunny, with a high near 49.