Castlegregory, Ireland offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Castlegregory is known for the Dingle Peninsula and the Maharees, which offer stunning beaches and outdoor activities. The best time to travel to Castlegregory, 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!