As of 3:49 PM CDT on June 18, 2026, out of 9 cities in Day County, SD in our database, 5 cities (56%) have a UV Index reading of Moderate, 3 cities (33%) have a UV Index reading of High, while 1 city (11%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Webster, SD with a reading of 6.5.
Over the next 24 hours, the highest UV Index reading in Day County, SD is expected to be 8.4 in Webster between 2:00 PM - 3:00 PM CDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |