As of 5:15 PM EDT on May 18, 2026, all 5 cities in Nassau County, FL in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Hilliard, FL with a reading of 3.9.
Over the next 24 hours, the highest UV Index reading in Nassau County, FL is expected to be 10.4 in Nassau Village-Ratliff between 1:00 PM - 2:00 PM EDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |