As of 1:55 PM EDT on August 18, 2026, all 13 cities in Monroe County, FL in our database have a UV Index reading of Extreme. The city with the highest UV Index reading right now is Key West, FL with a reading of 10.7.
Over the next 24 hours, the highest UV Index reading in Monroe County, FL is expected to be 10.7 in Key West between 1:00 PM - 2:00 PM EDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |