Alter do Chao, Brazil offers 1 beach perfect for sunbathing, surfing, swimming, and more. Alter do Chao is known for its stunning freshwater beaches and vibrant Amazonian culture. The best time to travel to Alter do Chão, Brazil, is from August to December, when the average air temperature is around 30°C (86°F) and the water temperature is approximately 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!