Port Williams, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Port Williams, Washington, United States, is known for the Dungeness National Wildlife Refuge and its proximity to the Olympic National Park. The best time to travel to Port Williams, United States, is during the summer months of June to August, when the average air temperature is around 55-65°F (13-18°C) and the water temperature is approximately 45-55°F (7-13°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!