Glassagh Lower, Ireland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Glassagh Lower, Ulster, Ireland, is known for its proximity to the stunning Glenveagh National Park and the scenic Wild Atlantic Way. The best time to travel to Glassagh Lower, 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!