Cockatoo Island, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Cockatoo Island, Western Australia, Australia, is known for its historic shipbuilding and iron ore mining sites. The best time to visit Cockatoo Island, Australia, is during the spring months of September to November, when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 18-20°C (64-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!