As of 7:39 AM CDT on August 11, 2026, all 483 cities in South Dakota in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Sioux Falls, SD with a reading of 0.1.
Over the next 24 hours, the highest UV Index reading in South Dakota is expected to be 7.9 in Custer between 1:00 PM - 2:00 PM MDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |