Garden Island, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Garden Island, Western Australia, Australia, is known for HMAS Stirling, a major naval base and its surrounding natural beauty and marine life. The best time to visit Garden Island, Australia, is from December to February, with average air temperatures around 25°C (77°F) and water temperatures near 22°C (72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!