Glenboy, Ireland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Glenboy, Connaught, Ireland, is known for its proximity to the scenic Lough Allen and the historic Arigna Mining Experience. The best time to travel to Glenboy, Ireland, is from May to September, with average air temperatures ranging from 10°C to 18°C and water temperatures around 12°C to 16°C. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!