Honaunau Napoopoo, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Honaunau Napoopoo is known for Puuhonua o Honaunau National Historical Park. The best time to travel to Honaunau Napoopoo, United States, is from November to April, with average air temperatures around 75-85°F and water temperatures around 75-80°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!