Greenbelt, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Greenbelt is known for the Greenbelt Park and the historic Greenbelt Museum. The best time to travel to Greenbelt, United States, is in late spring (May), when the average air temperature is around 70°F (21°C) and water temperatures in nearby bodies are typically cooler, around 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!