I-90 weather conditions near Spearfish, South Dakota

Roadnow AI Agent Live Update

7 day weather forecast

• Current condition: Fog/Mist 45°F 2025-10-15T04:15:00-06:00
• Overnight 2025-10-15, Patchy Drizzle and Dense Fog. Patchy drizzle with a slight chance of showers. Widespread dense fog. Otherwise, mostly cloudy, with a low around 43. East wind around 6 mph.
• Wednesday 2025-10-15, Chance Showers and Dense Fog. Patchy drizzle with a chance of showers before noon, then a slight chance of showers after 3pm. Widespread dense fog, mainly before 9am. Otherwise, mostly sunny, with a high near 58. East wind 7 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.
• Wednesday Night 2025-10-15, Showers and Patchy Fog. Showers likely and possibly a thunderstorm, then showers after midnight. Patchy fog after 9pm. Low around 46. East wind 6 to 10 mph becoming northwest after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 90%.
• Thursday 2025-10-16, Showers and Areas Fog. Showers, with thunderstorms also possible after 3pm. Areas of fog before 9am. High near 56. West wind 7 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.
• Thursday Night 2025-10-16, Chance Showers then Mostly Cloudy. A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 41. West wind 14 to 16 mph, with gusts as high as 25 mph.
• Friday 2025-10-17, Mostly Sunny and Breezy. Mostly sunny, with a high near 58. Breezy, with a west wind 15 to 21 mph, with gusts as high as 32 mph.
• Friday Night 2025-10-17, Chance Showers. A 40 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 37. West wind 11 to 14 mph, with gusts as high as 25 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 51. Breezy, with a west wind 13 to 21 mph, with gusts as high as 31 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, 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 58.
• Monday Night 2025-10-20, Chance Showers. A chance of showers. Partly cloudy, with a low around 36.
• Tuesday 2025-10-21, Slight Chance Showers then Mostly Sunny. A slight chance of showers. Mostly sunny, with a high near 52.