Ballycastle, United Kingdom offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Ballycastle is known for its stunning coastal scenery and proximity to the famous Giant's Causeway. The best time to travel to Ballycastle, United Kingdom, is from June to August, with average air temperatures around 15-18°C (59-64°F) and water temperatures around 13-15°C (55-59°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!