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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 Oct 9, 2026 1:33 AM UTC · Mostly dry
Lowest 65°F near Rapid City, South Dakota · Highest wind 12 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 Oct 9, 2026 1:33 AM UTC
65°F
74°F
12 mph
29.79-29.96 inHg
Conditions along I-90 in South Dakota
South Dakota road conditions & South Dakota 511
Dry
- Rapid City 68°F · 4 mph wind · Dry
- Sioux Falls 66°F · 6 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 Oct 9, 2026 1:33 AM UTC, and no lane closures or roadworks either. Always check with the responsible state DOT before setting off.
Winter reporting is off for the season. Iowa DOT's Winter Road Conditions – Midwest Region feed, which carries South Dakota DOT's segment-by-segment snow and ice conditions, runs from October 15 to April 15; outside that window it changes only as needed. Our own forecast below runs year-round.
Conditions are entered by South Dakota DOT maintenance staff and describe what is on the pavement, not the forecast. They reach this page through Iowa DOT's Winter Road Conditions – Midwest Region feed, published for reference; the authoritative report is SD511. Always check with SD511 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 Oct 8, 2026 12:07 PM UTC
Rapid City, SD weather
- In Rapid City, SD, the current weather is clear with a temperature of 52°F and a dew point of 36°F
- The humidity level is at 55%
- Winds are coming from the northwest at 3 to 6 mph
- The atmospheric pressure is measured at 30.06 inHg
- There is an active fire weather watch in effect from 11:00 AM to 8:00 PM on October 9, 2026
- While there are no immediate weather impacts reported for outdoor activities at this time, it is advisable to stay informed about the fire weather conditions as the day progresses.
Sioux Falls, SD weather
- Current weather conditions in Sioux Falls, SD indicate a temperature of 45.9°F with a dew point of 42.3°F and a humidity level of 87%
- The pressure is recorded at 30.12 inHg
- Winds are blowing from the southeast at 4 mph
- The sky is mostly cloudy, with cloud coverage at approximately 60%
- Visibility is good at 10.0 miles
- There are no active weather alerts at this time.
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 Oct 9, 2026 1:33 AM UTC. Right now temperatures run from 65°F to 74°F and the strongest wind is 12 mph.
- Where are South Dakota road closures reported officially?
- South Dakota's official traveler information service is SD511, at sd511.org, and it is where closures and restrictions are reported.
- How often does South Dakota DOT update winter road conditions?
- South Dakota DOT reports the winter condition of each stretch of state highway through Iowa DOT's Winter Road Conditions – Midwest Region feed, which runs from October 15 to April 15 and refreshes every 10 minutes. The conditions are entered by maintenance staff and describe what is on the pavement, not a forecast; this page shows the current report for I-90 in South Dakota beside our own road-surface forecast.
- 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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