As of 4:20 PM MDT on September 26, 2026, all 5 cities in Custer County, SD in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Custer, SD with a reading of 2.
Over the next 24 hours, the highest UV Index reading in Custer County, SD is expected to be 5.3 in Custer between 1:00 PM - 2:00 PM MDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |