Grasstree Beach, Australia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Grasstree Beach is known for its picturesque coastal scenery and proximity to the Great Barrier Reef. The best time to travel to Grasstree Beach, Australia, is from May to September, with average air temperatures around 20-25°C (68-77°F) and water temperatures around 22-25°C (72-77°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!