As of 2:50 PM EDT on August 18, 2025, out of 5 cities in Nassau County, FL in our database, 3 cities (60%) have a UV Index reading of Extreme, while 2 cities (40%) have a UV Index reading of Very High. The city with the highest UV Index reading right now is Yulee, FL with a reading of 10.6.
Over the next 24 hours, the highest UV Index reading in Nassau County, FL is expected to be 10.6 in Yulee 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 |