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 37°F 2025-10-18T23:35:00-06:00 
Overnight 2025-10-19, Mostly Clear. Mostly clear, with a low around 35. Southwest wind 8 to 10 mph, with gusts as high as 18 mph.
Sunday 2025-10-19, Sunny. Sunny, with a high near 65. Southwest wind 5 to 9 mph becoming west in the afternoon. Winds could gust as high as 17 mph.
Sunday Night 2025-10-19, Chance Showers and Breezy. A 50 percent chance of showers. Increasing clouds, with a low around 40. Breezy, with a west wind 9 to 14 mph increasing to 18 to 23 mph after midnight. Winds could gust as high as 32 mph.
Monday 2025-10-20, Chance Showers and Breezy. A 30 percent chance of showers, mainly after noon. Mostly sunny, with a high near 48. Breezy, with a west wind 23 to 29 mph, with gusts as high as 40 mph.
Monday Night 2025-10-20, Mostly Clear and Breezy. Mostly clear, with a low around 33. Breezy, with a west wind 17 to 23 mph, with gusts as high as 34 mph.- Tuesday 2025-10-21, Sunny. Sunny, with a high near 53. West wind 7 to 16 mph, with gusts as high as 26 mph.
- Tuesday Night 2025-10-21, Mostly Clear. Mostly clear, with a low around 39. Southwest wind 6 to 8 mph, with gusts as high as 15 mph.
- Wednesday 2025-10-22, Sunny. Sunny, with a high near 60. Southwest wind around 7 mph becoming northeast in the afternoon.
- Wednesday Night 2025-10-22, Partly Cloudy. Partly cloudy, with a low around 41.
Thursday 2025-10-23, Mostly Sunny. Mostly sunny, with a high near 59.- Thursday Night 2025-10-23, Mostly Clear. Mostly clear, with a low around 40.
- Friday 2025-10-24, Sunny. Sunny, with a high near 65.
- Friday Night 2025-10-24, Mostly Clear. Mostly clear, with a low around 47.
- Saturday 2025-10-25, Mostly Sunny. Mostly sunny, with a high near 69.