Triabunna, Australia offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Triabunna is known for its proximity to Maria Island National Park and the Maria Island Ferry. The best time to travel to Triabunna, Australia, is during the summer months of December to February, when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 17-20°C (63-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!