Nanakuli, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Nanakuli, Hawaii, United States, is known for its beautiful Nanakuli Beach Park and the nearby scenic Lualualei Valley. The best time to travel to Nanakuli, United States, is from April to October, with average air temperatures ranging from 75°F to 88°F and water temperatures around 77°F to 82°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!