Marvilla, Brazil offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Marvilla, Rio Grande do Sul, Brazil, is known for the Marvilla Wine Festival and the historic Marvilla Cathedral. The best time to travel to Marvilla, Brazil, is from June to September, with average air temperatures around 75°F (24°C) and water temperatures near 77°F (25°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!