Port Macdonnell, Australia offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Port Macdonnell is known for the Cape Northumberland Lighthouse and its proximity to the Southern Rock Lobster fishing industry. The best time to travel to Port Macdonnell, 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!