Howth, Ireland offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Howth is known for Howth Castle, Howth Head, and the Howth Cliff Walk. The best time to visit Howth, Ireland, 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!