Crosslake, Ireland offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Leinster, Ireland, is known for its historic landmarks such as the Rock of Cashel and the ancient monastic site of Glendalough. The best time to travel to Crosslake, Ireland, is from June to August, with average air temperatures around 60-70°F (15-21°C) and water temperatures around 55-60°F (13-16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!