Port Alsworth, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Port Alsworth is known for Lake Clark National Park and Preserve. The best time to travel to Port Alsworth, United States, is during the summer months of June to August, when the average air temperature is around 60-70°F and the water temperature is approximately 50-55°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!