Lake Munmorah, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Lake Munmorah is known for its beautiful national park and serene coastal landscapes. The best time to travel to Lake Munmorah, Australia, is during the summer months of December to February, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 22°C (72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!