Middle Beach, Australia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Middle Beach, South Australia, Australia, is known for the Adelaide International Bird Sanctuary and its proximity to the Gulf St Vincent. The best time to visit Middle Beach, Australia, is from December to February, with average air temperatures around 25-30°C (77-86°F) and water temperatures approximately 21-24°C (70-75°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!