Dirk Hartog Island, Australia offers 11 beaches perfect for sunbathing, surfing, swimming, and more. Dirk Hartog Island is known for its Dirk Hartog Island National Park and the historic site of Cape Inscription. The best time to visit Dirk Hartog Island, Australia, is from April to October, with average air temperatures ranging from 18°C to 26°C and water temperatures around 22°C. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!