Blackmans Bay, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Blackmans Bay is known for its picturesque Blackmans Bay Beach and the nearby Alum Cliffs. The best time to visit Blackmans Bay, 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!