Ngatangiia, French Polynesia offers 16 beaches perfect for sunbathing, surfing, swimming, and more. Ngatangiia, Cook Islands, is known for Muri Lagoon, a popular spot for snorkeling and water activities. The best time to travel to Ngatangiia, French Polynesia, is from May to October, when the average air temperature is around 77°F (25°C) and the water temperature is approximately 79°F (26°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!