As of 1:16 PM CDT on May 21, 2026, out of 13 cities in Clinton County, IL in our database, 8 cities (62%) have a UV Index reading of High, while 5 cities (38%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is St. Rose, IL with a reading of 6.1.
Over the next 24 hours, the highest UV Index reading in Clinton County, IL is expected to be 6.1 in St. Rose 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 |