As of 4:54 PM EDT on August 18, 2026, all 7 cities in Jefferson County, IN in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Madison, IN with a reading of 5.8.
Over the next 24 hours, the highest UV Index reading in Jefferson County, IN is expected to be 5.8 in Madison between 4:00 PM - 5:00 PM EDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |