Waialua, United States offers 10 beaches perfect for sunbathing, surfing, swimming, and more. Waialua is known for Waialua Sugar Mill and Mokuleia Beach Park. The best time to travel to Waialua, United States, is from April to October, with average air temperatures around 75-85°F and water temperatures ranging from 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!