As of 5:00 PM CDT on June 27, 2026, out of 1461 cities in Illinois in our database, 1152 cities (79%) have a UV Index reading of Low, while 309 cities (21%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Red Bud, IL with a reading of 3.
Over the next 24 hours, the highest UV Index reading in Illinois is expected to be 10.9 in Cairo 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 |