As of 9:24 AM CDT on June 21, 2026, all 6 cities in Jersey County, IL in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Fidelity, IL with a reading of 1.7.
Over the next 24 hours, the highest UV Index reading in Jersey County, IL is expected to be 2.9 in Jerseyville between 5:00 PM - 6:00 PM CDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |