Steszewko, Ireland offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Leinster, Ireland, is known for the historic city of Dublin, the ancient monastic site of Glendalough, and the scenic Wicklow Mountains. Steszewko is not in Ireland; however, if you meant to ask about the best time to visit Ireland, it is during late spring to early autumn (May to September) when the average air temperature is 10-17°C (50-63°F) and water temperature is around 12-16°C (54-61°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!