Bom Retiro, Brazil offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Bom Retiro, Parana, Brazil, is known for the Serra do Mar mountain range and the nearby Marumbi State Park. The best time to travel to Bom Retiro, Brazil, is from December to March, 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!