LAncresse Bay, Guernsey offers 1 beach perfect for sunbathing, surfing, swimming, and more. L'Ancresse Bay, Vale, Guernsey, is known for its stunning sandy beaches and scenic coastal golf course. The best time to visit L'Ancresse Bay, Guernsey, is from June to September, when the average air temperature is around 18°C (64°F) and the water temperature is approximately 16°C (61°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!