As of 6:51 PM EDT on September 18, 2025, all 17 cities in Charleston County, SC in our database 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 0.7.
Over the next 24 hours, the highest UV Index reading in Charleston County, SC is expected to be 7.6 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 |