As of 10:06 AM EDT on March 21, 2026, 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 Mount Pleasant, SC with a reading of 2.1.
Over the next 24 hours, the highest UV Index reading in Charleston County, SC is expected to be 6.3 in North Charleston between 1:00 PM - 2:00 PM EDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |