Hamilton Island, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Hamilton Island is known for its proximity to the Great Barrier Reef and the luxury resort Qualia. The best time to visit Hamilton Island, Australia, is from May to September, with average air temperatures around 23°C (73°F) and water temperatures about 24°C (75°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!