Dillon, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Dillon is known for Bannack State Park, Beaverhead County Museum, and Clark's Lookout State Park. The best time to travel to Dillon, United States, is during the summer months of June to August, when the average air temperature is around 70°F (21°C) and water temperature in nearby lakes is approximately 65°F (18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!