Keiss, United Kingdom offers 1 beach perfect for sunbathing, surfing, swimming, and more. Keiss is known for Keiss Castle and its scenic coastal views. The best time to travel to Keiss, United Kingdom, is during the summer months of June to August, when the average air temperature is around 15-18°C (59-64°F) and the water temperature is approximately 12-14°C (54-57°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!