Arlington, United States offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Arlington, South Dakota, United States, is known for the Lake Poinsett Recreation Area. The best time to travel to Arlington, United States, is in the spring (April to June) when the average air temperature is around 60-75°F (16-24°C) and water temperatures in nearby lakes are approximately 55-65°F (13-18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!