Walmer, United Kingdom offers 1 beach perfect for sunbathing, surfing, swimming, and more. Walmer is known for Walmer Castle and Gardens, a historic coastal artillery fortress and former residence of the Duke of Wellington. The best time to travel to Walmer, United Kingdom, is during the summer months of June to August, when the average air temperature is around 18°C (64°F) and the sea 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!