Saint Leonards, Ireland offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Saint Leonards, Leinster, Ireland, is known for its proximity to the scenic Hook Peninsula and the historic Hook Lighthouse. The best time to travel to Saint Leonards, 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!