UV Index 🇧🇷Brazil

Brazil straddles the equator — which crosses near the mouth of the Amazon — and extends south to the Tropic of Capricorn at 23°26′S. Most of the country lies in the tropical band where the WHO and WMO scale describes UV index values in the high single digits and tens as routine under clear midday skies. About 41% of the territory averages less than 200 m of elevation, so most Brazilians live close to sea level under direct tropical sun rather than at altitude.

The semi-arid sertão of the Northeast is one of Brazil's most extreme UV environments. Rainfall is erratic and locally as low as 560 mm per year (Quixeramobim), keeping skies clear for long stretches. During the May–November dry season, temperatures regularly exceed 38 °C in this region — a sign of the persistent, unattenuated solar load. The interior plateau, with cities like Brasília at 1,172 m, adds an altitude component to the equation in central Brazil.

Brazil sits at #97 of 191 in the WHO's global ambient-UV ranking with about 4,552 J/m² of average daily UV, around the 49th percentile worldwide.