Coroa Grande, Brazil offers 1 beach perfect for sunbathing, surfing, swimming, and more. Coroa Grande, Rio de Janeiro, Brazil, is known for its proximity to the beautiful beaches of Sepetiba Bay and the nearby Ilha Grande. The best time to travel to Coroa Grande, Brazil, is from May to September, with average air temperatures around 70-80°F (21-27°C) and water temperatures around 75-80°F (24-27°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!