Castlebane, Ireland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Castlebane is known for the historic Castlebane Castle and the annual Castlebane Celtic Festival. The best time to travel to Castlebane, Ireland, is from May to September, with average air temperatures around 55-65°F (13-18°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!