Grassy Head, Australia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Grassy Head, New South Wales, Australia, is known for its proximity to the Yarriabini National Park and the scenic Grassy Head Beach. The best time to travel to Grassy Head, Australia, is from December to February, with average air temperatures around 25°C (77°F) and water temperatures about 23°C (73°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!