Sultan, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Sultan, Washington, United States, is known for the Skykomish River and the nearby Wallace Falls State Park. The best time to travel to Sultan, United States, is during the summer months of June to August, when the average air temperature is around 70-80°F and water temperatures in nearby rivers are typically 50-60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!