Wonboyn, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Wonboyn, New South Wales, Australia, is known for Wonboyn Lake and Ben Boyd National Park. The best time to travel to Wonboyn, Australia, is during the summer months of December to February, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 22°C (72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!