As of 6:18 PM CDT on March 21, 2026, all 9 cities in Grundy County, IA in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Grundy Center, IA with a reading of 0.4.
Over the next 24 hours, the highest UV Index reading in Grundy County, IA is expected to be 4.8 in Grundy Center between 2:00 PM - 3:00 PM CDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |