As of 4:12 PM CDT on October 21, 2025, all 8 cities in Grundy County, MO in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Trenton, MO with a reading of 1.6.
Over the next 24 hours, the highest UV Index reading in Grundy County, MO is expected to be 3.5 in Trenton 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 |