As of 3:32 PM EDT on May 21, 2026, out of 17 cities in Charleston County, SC in our database, 7 cities (41%) have a UV Index reading of Very High, 4 cities (24%) have a UV Index reading of Moderate, 4 cities (24%) have a UV Index reading of High, while 2 cities (12%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Kiawah Island, SC with a reading of 8.6.
Over the next 24 hours, the highest UV Index reading in Charleston County, SC is expected to be 10.3 in Kiawah Island between 1:00 PM - 2:00 PM EDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |