Marechal Deodoro, Brazil offers 1 beach perfect for sunbathing, surfing, swimming, and more. Marechal Deodoro is known for its beautiful beaches and rich colonial history. The best time to travel to Marechal Deodoro, Brazil, is from September to March, when the average air temperature ranges from 25°C to 30°C (77°F to 86°F) and the water temperature is around 27°C (81°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!