Y Felinheli, United Kingdom offers 1 beach perfect for sunbathing, surfing, swimming, and more. Y Felinheli is known for its proximity to the Menai Strait and the historic Dinorwic Slate Quarry. The best time to travel to Y Felinheli, United Kingdom, is during the summer months of June to August, when the average air temperature is around 15-20°C (59-68°F) and the water temperature is approximately 14-16°C (57-61°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!