Cocagne, Guernsey offers 1 beach perfect for sunbathing, surfing, swimming, and more. Cocagne is known for the Cocagne Island and its scenic coastal views. Vale is known for the Vale Castle and its historical significance. Guernsey is known for Castle Cornet and its beautiful beaches. The best time to travel to Cocagne, Guernsey is during the summer months of June to August, when the average air temperature is around 20°C (68°F) and the water 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!