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South Dakota I-90 Road Conditions
I-90 Road Conditions in South Dakota
Updated Aug 24, 2026 12:34 AM UTC · Mostly dry
Lowest 73°F near Sioux Falls, South Dakota · Highest wind 21 mph near Rapid City, South Dakota
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Interstate 90 crosses South Dakota for 413 miles, from the Wyoming line at the edge of the Black Hills to the Minnesota line beyond Sioux Falls, over the Missouri River at Chamberlain. There is very little shelter on it: the state closes the road at gates when a ground blizzard takes the visibility, and the closure can run for hundreds of miles while the sky at either end looks clear.
- Road system: Interstate Highway System
- Length: 413 miles
- Crosses: the Missouri River at Chamberlain
- Runs from: the Wyoming line to the Minnesota line
Weather data from Aug 24, 2026 12:34 AM UTC
73°F
91°F
21 mph
1004-1015 hPa
Current I-90 in South Dakota Conditions by State
South Dakota I-90 in South Dakota road conditions
Dry
- Rapid City 77°F · 11 mph wind · Dry
- Sioux Falls 81°F · 8 mph wind · Dry
See live weather forecast for Interstate 90 across South Dakota. Get real‑time road and weather conditions displayed directly on the interactive map for the drive from the Wyoming state line through Spearfish, Rapid City, Wall, Chamberlain and Mitchell to Sioux Falls and the Minnesota state line.
The map shows live weather conditions along the route, updated frequently to help drivers plan around the wind, blowing snow and gate closures that define winter driving here. Forecasts are generated for the next 6 hours at key highway points and include temperature and weather conditions such as clear skies, rain, storms, snow, high wind, hail, and more.
No full closures are reported on I-90 in South Dakota as of Aug 24, 2026 12:34 AM UTC, and no lane closures or roadworks either. Always check with the responsible state DOT before setting off.
Rapid City, SD weather
- In Rapid City, SD, the weather is currently clear with a temperature of 20.0°C (68°F) and a humidity level of 87%
- The wind is blowing from the southeast at 8.4 kph (5 mph)
- Visibility is good at 16 km (9.9 miles)
- The atmospheric pressure is measured at 1011 mb (29.83 inHg)
- There are no active weather alerts at this time, and the probability of precipitation is 0%.
Sioux Falls, SD weather
- The current weather in Sioux Falls, SD, indicates a temperature of 13.5°C (56°F) with a dew point of 11.6°C (53°F), resulting in a relative humidity of 88%
- The sky is partly cloudy, covering approximately 50%
- Winds are coming from the southeast at 8 km/h (5 mph), with a visibility of 16.1 km (10.0 miles)
- The atmospheric pressure is measured at 1020 mb (30.12 inHg)
- The probability of precipitation is currently 0%, indicating no expected rain
- Conditions are stable for the time being, with no weather alerts in effect.
I-90 in South Dakota Road Weather FAQ
- Is I-90 in South Dakota closed right now?
- No full closures are reported on I-90 in South Dakota. No lane closures or roadworks are reported either.
- What are I-90 in South Dakota road conditions today?
- The map on this page colours the route along I-90 in South Dakota by what is on the carriageway right now — dry, wet, slush, snow or ice — from radar and surface data, last updated Aug 24, 2026 12:34 AM UTC. Right now temperatures run from 73°F to 91°F and the strongest wind is 21 mph.
- How often are I-90 in South Dakota road conditions updated?
- The road surface and weather layers are rebuilt whenever this page is opened with data more than ten minutes old, and refreshed on a schedule in between, so nothing here is more than about two hours old even on a road nobody has looked at. Closures and road blocks are re-imported from the state 511 feeds every fifteen minutes, and the written state-by-state summaries are refreshed daily. Every section on this page carries the time its data was fetched.
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