Rio Grande, Brazil offers 16 beaches perfect for sunbathing, surfing, swimming, and more. Rio Grande is known for the Molhes da Barra, Museu Oceanografico, and Praia do Cassino. The best time to travel to Rio Grande, 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!