As of 4:30 PM EST on November 19, 2025, all 13 cities in St. Johns County, FL in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is St. Augustine, FL with a reading of 0.9.
Over the next 24 hours, the highest UV Index reading in St. Johns County, FL is expected to be 4.8 in St. Augustine between 12:00 PM - 1:00 PM EST tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |