As of 11:13 AM CDT on September 21, 2025, all 5 cities in Mellette County, SD in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is White River, SD with a reading of 2.9.
Over the next 24 hours, the highest UV Index reading in Mellette County, SD is expected to be 5.7 in White River between 2:00 PM - 3:00 PM CDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |