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I-90 South Dakota Road Conditions
Radar and live pavement conditions on the 413 miles of I-90 in South Dakota — plus closures, road work and city-by-city weather across the state.
Updated Sep 15, 2026 1:18 AM UTC · Mostly dry
Lowest 66°F near Sioux Falls, South Dakota · Highest wind 17 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 Sep 15, 2026 1:18 AM UTC
66°F
74°F
17 mph
29.60-29.75 inHg
Current I-90 in South Dakota Conditions by State
South Dakota I-90 in South Dakota road conditions
Dry
- Rapid City 73°F · 12 mph wind · Dry
- Sioux Falls 66°F · 3 mph wind · Dry
I-90 crosses 413 miles of South Dakota, between the Minnesota line and the Wyoming line. That is 14% of I-90's 3,020 miles.
Inside South Dakota it meets I-29 at Sioux Falls.
By mile marker, I-90 passes Rapid City 58 · Sioux Falls 398.
No full closures are reported on I-90 in South Dakota as of Sep 15, 2026 1:18 AM UTC, and no lane closures or roadworks either. Always check with the responsible state DOT before setting off.
| Place | Snow a year | Snow days | Freezing nights | Freeze–thaw days | First freeze | Last freeze | Days over 90°F |
|---|---|---|---|---|---|---|---|
| Rapid City | 49.3" | 33.1 | 141.1 | 99.1 | Oct 7 | May 2 | 17.9 |
| Sioux Falls | 44.5" | 32.4 | 164.3 | 99.2 | Sep 29 | May 3 | 13.8 |
NOAA 1991–2020 Climate Normals, from 2 weather stations in South Dakota. A dash is a figure that station does not report, not a zero.
Towns Along I-90 in South Dakota
From Spearfish to Brandon, with the position of each town measured along this stretch itself — counted from the Spearfish end, not from a state milepost, so it will not match the numbers on the signs.
- 13 mi Spearfish
- 32 mi Sturgis 1.2 mi off the road
- 49 mi Summerset
- 58 mi Rapid City 2.3 mi off the road
- 64 mi Box Elder
- 330 mi Mitchell 2.4 mi off the road
- 365 mi Salem 3.9 mi off the road
- 383 mi Hartford
- 398 mi Sioux Falls 4.6 mi off the road
- 402 mi Brandon 1.2 mi off the road
Places from the US Census Gazetteer and population estimates, both public domain; distances measured along this page's own route geometry.
Summaries fetched Sep 14, 2026 12:07 PM UTC
Rapid City, SD weather
- Current weather conditions in Rapid City, SD indicate a temperature of 61.5°F with high humidity at 96%
- The dewpoint is at 60.3°F, reflecting the moist air
- Winds are coming from the southeast at 8.9 MPH
- The atmospheric pressure is measured at 29.6 inHg
- Rain showers are currently affecting the area, contributing to a visibility of approximately 9.8 miles
- The probability of precipitation is high, suggesting that further rain could be expected.
Sioux Falls, SD weather
- Current weather conditions in Sioux Falls, SD indicate a high risk of lightning, with 63 lightning strikes reported within the past 5 minutes
- Additionally, there is a low risk of rain, with expected rainfall rates of 0.13 in/h within the next 5 minutes
- Thunderstorms are present, contributing to a temperature of 57°F and a humidity level of 92%
- Winds are blowing from the southeast at 16 mph with a visibility of 5.0 miles
- The atmospheric pressure is measured at 30.06 inHg
- No active alerts are currently issued for the area.
I-90 in South Dakota Road Weather FAQ
- Is Interstate 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 colors the route along I-90 in South Dakota by what is on the pavement right now — dry, wet, slush, snow or ice — from radar and surface data, last updated Sep 15, 2026 1:18 AM UTC. Right now temperatures run from 66°F to 74°F and the strongest wind is 17 mph.
- Where are South Dakota road closures reported officially?
- South Dakota's official traveler information service is sd511.org, and it is where closures and restrictions are reported.
- 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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