As of 3:15 PM CDT on June 18, 2026, out of 14 cities in Randolph County, IL in our database, 13 cities (93%) have a UV Index reading of High, while 1 city (7%) have a UV Index reading of Very High. The city with the highest UV Index reading right now is Rockwood, IL with a reading of 7.6.
Over the next 24 hours, the highest UV Index reading in Randolph County, IL is expected to be 9.9 in Chester 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 |