Tonasket, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Tonasket, Washington, United States, is known for its proximity to the Okanogan River and the nearby Okanogan-Wenatchee National Forest. The best time to travel to Tonasket, United States, is in late spring or early fall when the average air temperature is around 60-70°F, and water temperatures in nearby lakes are typically cooler, around 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!