Cayo Largo del Sur, Cuba offers 1 beach perfect for sunbathing, surfing, swimming, and more. Cayo Largo del Sur is known for its pristine beaches like Playa Paraiso and Playa Sirena, as well as its vibrant coral reefs and marine life. The best time to travel to Cayo Largo del Sur, Cuba, is from December to April, with average air temperatures around 77-82°F (25-28°C) and water temperatures around 77-81°F (25-27°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!