Olowalu, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Olowalu, Hawaii, United States, is known for Olowalu Reef, a popular snorkeling and diving spot with vibrant marine life. The best time to travel to Olowalu, United States, is from April to October, with average air temperatures around 75-85°F and water temperatures about 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!