Bolonia, Spain, Spain offers 1 beach perfect for sunbathing, surfing, swimming, and more. Bolonia, Spain, is known for its well-preserved Roman ruins and beautiful beaches. The best time to travel to Bolonia, Spain, is from June to September, with average air temperatures around 25-30°C (77-86°F) and water temperatures around 20-23°C (68-73°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!