Highcliffe on Sea, United Kingdom offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Highcliffe on Sea is known for Highcliffe Castle and its scenic coastal views. The best time to travel to Highcliffe on Sea, 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 sea 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!