Ballywater, Ireland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ballywater is known for the Ballywater Castle and the annual Ballywater Music Festival. The best time to travel to Ballywater, Ireland, is from June to August, when the average air temperature is around 15-20°C (59-68°F) and the water temperature is approximately 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!