Costa Azul, Mexico offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Costa Azul, Chiapas, Mexico, is known for its stunning beaches and proximity to the renowned Sumidero Canyon. The best time to travel to Costa Azul, Mexico, is from November to April, with average air temperatures around 75°F (24°C) and water temperatures near 78°F (26°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!