Johns Island, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Johns Island is known for the Angel Oak Tree, a massive and ancient Southern live oak. The best time to visit Johns Island, United States, is in the spring (March to May) when the average air temperature is around 65-75°F and the water temperature is approximately 60-70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!