As of 11:19 AM CDT on September 16, 2026, out of 1461 cities in Illinois in our database, 1024 cities (70%) have a UV Index reading of Moderate, while 437 cities (30%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Cairo, IL with a reading of 5.3.
Over the next 24 hours, the highest UV Index reading in Illinois is expected to be 7.4 in Metropolis 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 |