Muskey Bay, New Zealand offers 1 beach perfect for sunbathing, surfing, swimming, and more. Muskey Bay, Southland, New Zealand, is known for its proximity to Fiordland National Park and the stunning Milford Sound. The best time to travel to Muskey Bay, New Zealand, is during the summer months of December to February, when the average air temperature is around 70°F (21°C) and the water temperature is approximately 68°F (20°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!