São Sebastião, Brazil offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Sao Sebastiao is known for its stunning beaches and vibrant coastal tourism. The best time to travel to São Sebastião, Brazil, is from March to May, when the average air temperature ranges from 22°C to 28°C (72°F to 82°F) and the water temperature is around 25°C (77°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!