Clos du Valle, Guernsey offers 1 beach perfect for sunbathing, surfing, swimming, and more. Clos du Valle, Vale, Guernsey, is known for Vale Castle and the picturesque Vale Pond. The best time to travel to Clos du Valle, Guernsey, is from June to September, with average air temperatures around 15-20°C (59-68°F) and sea temperatures 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!