As of 2:54 PM CDT on April 20, 2025, out of 483 cities in South Dakota in our database, 287 cities (59%) have a UV Index reading of Moderate, 193 cities (40%) have a UV Index reading of High, while 3 cities (1%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Custer, SD with a reading of 6.9.
Over the next 24 hours, the highest UV Index reading in South Dakota is expected to be 6.9 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 |