La Union, Spain offers 3 beaches perfect for sunbathing, surfing, swimming, and more. La Union, Region of Murcia, Spain, is known for the International Festival of Cante de las Minas. The best time to travel to La Union, Spain, is from May to September, with average air temperatures ranging from 70°F to 85°F and water temperatures around 70°F to 75°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!