As of 12:43 PM CDT on May 12, 2025, out of 11 cities in Grundy County, IL in our database, 6 cities (55%) have a UV Index reading of High, while 5 cities (45%) have a UV Index reading of Very High. The city with the highest UV Index reading right now is Minooka, IL with a reading of 7.8.
Over the next 24 hours, the highest UV Index reading in Grundy County, IL is expected to be 7.8 in Minooka between 12:00 PM - 1:00 PM CDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |