Harold Island, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Harold Island, Queensland, Australia, is known for the Great Barrier Reef. The best time to travel to Harold Island, Australia, is during the dry season from May to October, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 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!