Roundstone, Ireland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Roundstone is known for its picturesque harbor and vibrant arts community. The best time to travel to Roundstone, Ireland, is from May to September, with average air temperatures ranging from 12°C to 18°C and water temperatures around 12°C to 15°C. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!