Glassillaun, Ireland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Durankulak is known for the Durankulak Lake and the Durankulak Archaeological Complex. The best time to travel to Glassillaun, Ireland, is from June to August, with average air temperatures around 15-20°C (59-68°F) and water temperatures around 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!