William Bay, Australia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. William Bay, Western Australia, is known for Greens Pool and Elephant Rocks. The best time to visit William Bay, Australia, is from December to February, with average air temperatures around 25°C (77°F) and water temperatures near 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!