Chelan, United States offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Progress Valley, Southland, New Zealand, is known for the stunning Fiordland National Park and the iconic Milford Sound. The best time to travel to Chelan, United States, is in July when the average air temperature is around 85°F (29°C) and the water temperature is approximately 70°F (21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!