Llanfairpwllgwyngyll, United Kingdom offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Llanfairpwllgwyngyll is known for having one of the longest place names in the world and its famous railway station sign. The best time to travel to Llanfairpwllgwyngyll, United Kingdom, is during late spring to early autumn (May to September) when the average air temperature is around 15-20°C (59-68°F) and the water temperature is approximately 12-16°C (54-61°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!