As of 3:34 AM CST on November 21, 2024, all 7 cities in Johnson County, IL in our database have a UV Index reading of 0, indicating no radiation from the sun.
Over the next 24 hours, the highest UV Index reading in Johnson County, IL is expected to be 2.4 in Vienna between 12:00 PM - 1:00 PM CST today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |