Oak Grove, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Oak Grove, Arkansas, United States, is known for its proximity to the Ozark Mountains and the Buffalo National River. The best time to travel to Oak Grove, United States, is in late spring (May), when the average air temperature is around 70°F (21°C) and the water temperature 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!