Baia da Sao Marcos, Brazil offers 1 beach perfect for sunbathing, surfing, swimming, and more. Baia da Sao Marcos is known for its stunning beaches and vibrant coastal tourism. The best time to travel to Baía de São Marcos, Brazil, is from July to September, when the average air temperature is around 26°C (79°F) and the water temperature is approximately 27°C (81°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!