Muir Eireann, Ireland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Muir Eireann is known for the Muir Eireann Castle and the annual Muir Eireann Music Festival. The best time to travel to Muir Eireann, 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!