Greenbrier, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Greenbrier, Arkansas, United States, is known for its proximity to the Ozark National Forest and Woolly Hollow State Park. The best time to travel to Greenbrier, United States, is in late spring (May), 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!