Greatstone, United Kingdom offers 1 beach perfect for sunbathing, surfing, swimming, and more. Greatstone, England, United Kingdom, is known for its proximity to the Dungeness National Nature Reserve and the Romney, Hythe & Dymchurch Railway. The best time to travel to Greatstone, United Kingdom, is during the summer months of June to August, when the average air temperature is around 18-22°C (64-72°F) and the water temperature is approximately 16-18°C (61-64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!