Port Arthur, Australia offers 10 beaches perfect for sunbathing, surfing, swimming, and more. Port Arthur, Tasmania, Australia, is known for the Port Arthur Historic Site, a well-preserved penal settlement and UNESCO World Heritage site. The best time to travel to Port Arthur, 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 17-19°C (63-66°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!