As of 11:14 AM CDT on August 4, 2026, out of 10 cities in Jefferson County, KS in our database, 5 cities (50%) have a UV Index reading of Moderate, while 5 cities (50%) have a UV Index reading of High. The city with the highest UV Index reading right now is Williamstown, KS with a reading of 6.
Over the next 24 hours, the highest UV Index reading in Jefferson County, KS is expected to be 8.9 in McLouth between 1:00 PM - 2:00 PM CDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |