Wilsons Promontory, Australia offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Wilsons Promontory, Victoria, Australia, is known for Wilsons Promontory National Park. The best time to visit Wilsons Promontory, 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!