Praia Costazul, Brazil offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Praia Costazul, Rio de Janeiro, Brazil, is known for its stunning beaches and vibrant nightlife. The best time to travel to Praia Costazul, Brazil, is from April to September, with average air temperatures around 75°F (24°C) and water temperatures near 72°F (22°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!