As of 3:32 PM CDT on April 28, 2026, out of 6 cities in Monroe County, IL in our database, 5 cities (83%) have a UV Index reading of Moderate, while 1 city (17%) have a UV Index reading of High. The city with the highest UV Index reading right now is Hecker, IL with a reading of 5.6.
Over the next 24 hours, the highest UV Index reading in Monroe County, IL is expected to be 7.3 in Columbia 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 |