Prevost, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Prevost, Washington, United States, is known for its proximity to the scenic Mount Rainier National Park. The best time to travel to Prevost, United States, is during the summer months of June to August, when the average air temperature is around 75°F (24°C) and 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!