As of 3:27 PM CDT on May 20, 2026, all 6 cities in Monroe County, IL in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Waterloo, IL with a reading of 4.7.
Over the next 24 hours, the highest UV Index reading in Monroe County, IL is expected to be 6.6 in Waterloo between 2:00 PM - 3:00 PM CDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |