Gyleen, Ireland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Gyleen, Munster, Ireland, is known for the scenic Gyleen Beach and the historic Gyleen Castle. The best time to travel to Gyleen, Ireland, is from June to August, with average air temperatures around 60-70°F (15-21°C) and water temperatures around 55-60°F (13-16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!