Muriwai, New Zealand offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Muriwai is known for its stunning black sand beaches and the Muriwai Gannet Colony. The best time to travel to Muriwai, New Zealand, 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!