As of 6:30 PM CDT on July 18, 2025, all 10 cities in Jefferson County, KS in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Williamstown, KS with a reading of 1.2.
Over the next 24 hours, the highest UV Index reading in Jefferson County, KS is expected to be 10.2 in Perry between 1:00 PM - 2:00 PM CDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |