Hartford, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Hartford, South Dakota, United States, is known for its proximity to the Sioux Empire Fair and the annual Hartford Jamboree Days. The best time to travel to Hartford is in late spring (May to June) when the average air temperature is around 60-75°F (16-24°C) and 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!