Sammamish, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sammamish is known for Pine Lake Park and the Sammamish River Trail. The best time to travel to Sammamish, United States, is during the summer months of July and August, when the average air temperature is around 75°F (24°C) and the water temperature in nearby lakes 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!