Rottnest Island, Australia offers 34 beaches perfect for sunbathing, surfing, swimming, and more. Rottnest Island is known for its unique wildlife, particularly the quokka, and its beautiful beaches and bays. The best time to visit Rottnest Island, Australia, is from October to April, with average air temperatures ranging from 18°C to 30°C and water temperatures from 20°C to 22°C. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!