Kapaau, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Kapaau is known for the King Kamehameha I Statue. The best time to travel to Kapaau, United States, is from May to October, with average air temperatures around 75°F (24°C) and water temperatures near 77°F (25°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!