Ponta dos Castelhanos, Brazil offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ponta dos Castelhanos, Rio de Janeiro, Brazil, is known for its stunning beaches and proximity to the Ilha Grande State Park. The best time to travel to Ponta dos Castelhanos, Brazil, is from September to November, with average air temperatures around 27°C (81°F) and water temperatures near 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!