As of 11:16 AM CDT on September 22, 2025, all 4 cities in Clay County, SD in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Vermillion, SD with a reading of 3.2.
Over the next 24 hours, the highest UV Index reading in Clay County, SD is expected to be 5.5 in Vermillion between 1:00 PM - 2:00 PM CDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |