As of 5:34 PM EDT on August 29, 2025, all 17 cities in Sumter County, SC in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Sumter, SC with a reading of 2.7.
Over the next 24 hours, the highest UV Index reading in Sumter County, SC is expected to be 6.6 in Sumter between 3:00 PM - 4:00 PM EDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |