As of 5:33 PM EDT on September 8, 2026, out of 13 cities in St. Johns County, FL in our database, 7 cities (54%) have a UV Index reading of Low, while 6 cities (46%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is St. Augustine, FL with a reading of 2.5.
Over the next 24 hours, the highest UV Index reading in St. Johns County, FL is expected to be 8.5 in St. Augustine 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 |