Seaton Sluice, United Kingdom offers 1 beach perfect for sunbathing, surfing, swimming, and more. Seaton Sluice is known for its historic Seaton Delaval Hall and the picturesque Seaton Sluice Harbour. The best time to travel to Seaton Sluice, United Kingdom, is during the summer months of June to August, when the average air temperature is around 15-20°C (59-68°F) and the North Sea water temperature is approximately 13-16°C (55-61°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!