As of 2:20 PM CDT on August 19, 2026, all 4 cities in Clay County, SD in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Vermillion, SD with a reading of 6.6.
Over the next 24 hours, the highest UV Index reading in Clay County, SD is expected to be 7.1 in Vermillion between 1:00 PM - 2:00 PM CDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |