Danville, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Danville, Iowa, United States, is known for the Geode State Park. The best time to travel to Danville, United States, is in late spring (May), when the average air temperature is around 70°F (21°C) and the water temperature in nearby lakes is approximately 60°F (16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!