As of 3:46 PM CDT on July 1, 2026, all 5 cities in Hamilton County, IL in our database have a UV Index reading of Very High. The city with the highest UV Index reading right now is Dahlgren, IL with a reading of 7.7.
Over the next 24 hours, the highest UV Index reading in Hamilton County, IL is expected to be 10.1 in McLeansboro 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 |