Asseiceira, Portugal offers 1 beach perfect for sunbathing, surfing, swimming, and more. Asseiceira, Beja, Portugal, is known for its proximity to the Alqueva Dam, the largest artificial lake in Europe. The best time to travel to Asseiceira, Portugal, is from May to September, with average air temperatures ranging from 20°C to 30°C and water temperatures around 18°C to 22°C. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!