Fort Peck, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Fort Peck is known for the Fort Peck Dam and Lake, which offer recreational activities and scenic views. The best time to travel to Fort Peck, 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!