Blackrock, Ireland offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Blackrock is known for the Blackrock Market and its proximity to the scenic Dublin Bay. The best time to travel to Blackrock, 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!