Sanibel, United States offers 13 beaches perfect for sunbathing, surfing, swimming, and more. Sanibel is known for its beautiful shell-covered beaches and the J.N. "Ding" Darling National Wildlife Refuge. The best time to travel to Sanibel, United States, is from December to April, with average air temperatures ranging from 70°F to 80°F and water temperatures around 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!