Sandown, United Kingdom offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Sandown, England, United Kingdom, is known for the Dinosaur Isle museum and its sandy beaches. The best time to travel to Sandown, United Kingdom, is from June to August when the average air temperature is around 18°C (64°F) and the water temperature is approximately 17°C (63°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!