Lilliwaup, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Lilliwaup is known for the Hama Hama Oyster Company and its proximity to the Olympic National Park. The best time to travel to Lilliwaup, United States, is during the summer months of July and August, when the average air temperature is around 70°F (21°C) and the water temperature is approximately 55°F (13°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!