Ballyhornan, United Kingdom offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ballyhornan, Northern Ireland, United Kingdom, is known for its proximity to the scenic Strangford Lough and the historic St. Patrick's Way pilgrimage trail. The best time to travel to Ballyhornan, United Kingdom, is from June to August, with average air temperatures around 15-20°C (59-68°F) and sea 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!