As of 4:29 PM CDT on June 11, 2026, out of 119 cities in Cook County, IL in our database, 76 cities (64%) have a UV Index reading of Moderate, while 43 cities (36%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Dolton, IL with a reading of 4.9.
Over the next 24 hours, the highest UV Index reading in Cook County, IL is expected to be 9.3 in Chicago 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 |