As of 2:22 PM EDT on September 20, 2026, all 6 cities in Jefferson County, TN in our database have a UV Index reading of Very High. The city with the highest UV Index reading right now is Jefferson City, TN with a reading of 7.7.
Over the next 24 hours, the highest UV Index reading in Jefferson County, TN is expected to be 7.7 in Jefferson City 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 |