As of 12:50 PM CDT on September 18, 2026, out of 16 cities in Knox County, IL in our database, 13 cities (81%) have a UV Index reading of Moderate, 2 cities (13%) have a UV Index reading of Low, while 1 city (6%) have a UV Index reading of High. The city with the highest UV Index reading right now is Yates City, IL with a reading of 5.8.
Over the next 24 hours, the highest UV Index reading in Knox County, IL is expected to be 5.8 in Yates City between 12:00 PM - 1:00 PM CDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |