Swan Island, Australia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Swan Island, Victoria, Australia, is known for its historical military training facilities and restricted access, making it a unique point of interest for those intrigued by military history. The best time to travel to Swan Island, Australia, is during the summer months of December to February, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 21°C (70°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!