UV index and sunburn time in Puerto Rico
Peak UV index and how quickly unprotected skin burns, for 3 cities in Puerto Rico.
| City | Peak UV | Category | Month | Burns after |
|---|---|---|---|---|
| San Juan | 14.9 | Extreme | August | 16 min |
| Bayamón | 14.9 | Extreme | August | 16 min |
| Carolina | 14.9 | Extreme | August | 16 min |
The same UV also drives vitamin D synthesis — and stops entirely for part of the year at higher latitudes. Vitamin D winters in Puerto Rico →
Burn times are for skin type III with no sunscreen. How these are calculated