As of 4:22 PM EDT on June 18, 2026, all 7 cities in Barnwell County, SC in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Snelling, SC with a reading of 7.2.
Over the next 24 hours, the highest UV Index reading in Barnwell County, SC is expected to be 11.1 in Williston 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 |