As of 1:51 PM EDT on September 18, 2026, out of 17 cities in Sumter County, SC in our database, 10 cities (59%) have a UV Index reading of Moderate, 5 cities (29%) have a UV Index reading of Very High, while 2 cities (12%) have a UV Index reading of High. The city with the highest UV Index reading right now is South Sumter, SC with a reading of 7.6.
Over the next 24 hours, the highest UV Index reading in Sumter County, SC is expected to be 7.6 in Privateer between 2:00 PM - 3:00 PM EDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |