Key Biscayne, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Key Biscayne is known for Crandon Park, Bill Baggs Cape Florida State Park, and the Miami Seaquarium. The best time to travel to Key Biscayne is from December to April, with average air temperatures around 75°F (24°C) and water temperatures near 73°F (23°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!