Doonbeg, Ireland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Doonbeg is known for the Trump International Golf Links & Hotel. The best time to travel to Doonbeg, Ireland, is from May to September, with average air temperatures ranging from 50-65°F (10-18°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!