UV index and sunburn time in Portugal
Peak UV index and how quickly unprotected skin burns, for 3 cities in Portugal.
| City | Peak UV | Category | Month | Burns after |
|---|---|---|---|---|
| Lisbon | 10.2 | Very high | July | 23 min |
| Porto | 9.6 | Very high | July | 24 min |
| Braga | 9.5 | Very high | July | 24 min |
The same UV also drives vitamin D synthesis — and stops entirely for part of the year at higher latitudes. Vitamin D winters in Portugal →
Burn times are for skin type III with no sunscreen. How these are calculated