Biscayne, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Biscayne, Florida, United States, is known for Biscayne National Park, which offers stunning coral reefs and diverse marine life. The best time to travel to Biscayne, United States, is from December to April, with average air temperatures around 70-80°F and water temperatures around 75°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!