Barreirinhas, Brazil offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Barreirinhas is known for being the gateway to the Lençóis Maranhenses National Park. The best time to travel to Barreirinhas, Brazil, is from June to September, with average air temperatures around 28°C (82°F) and water temperatures near 26°C (79°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!