As of 12:00 PM EDT on August 31, 2026, out of 11 cities in Knox County, OH in our database, 7 cities (64%) have a UV Index reading of High, while 4 cities (36%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Martinsburg, OH with a reading of 6.6.
Over the next 24 hours, the highest UV Index reading in Knox County, OH is expected to be 8 in Mount Vernon between 2:00 PM - 3:00 PM EDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |