As of 8:36 PM EDT on June 29, 2025, all 10 cities in Mercer County, OH in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Coldwater, OH with a reading of 0.2.
Over the next 24 hours, the highest UV Index reading in Mercer County, OH is expected to be 10.2 in Burkettsville between 2:00 PM - 3:00 PM EDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |