As of 2:34 PM CDT on September 1, 2025, out of 1461 cities in Illinois in our database, 1445 cities (99%) have a UV Index reading of High, 15 cities (1%) have a UV Index reading of Moderate, while 1 city (0%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Metropolis, IL with a reading of 7.1.
Over the next 24 hours, the highest UV Index reading in Illinois is expected to be 7.3 in Rantoul 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 |