Cape Portland, Australia offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Cape Portland, Tasmania, Australia, is known for the Cape Portland Wind Farm and its proximity to the Mount William National Park. The best time to travel to Cape Portland, 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 18-20°C (64-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!