Crestuma, Portugal offers 1 beach perfect for sunbathing, surfing, swimming, and more. Crestuma, Porto, Portugal, is known for the Crestuma-Lever Dam and its scenic views along the Douro River. The best time to travel to Crestuma, Portugal, is from May to September, with average air temperatures around 70-80°F (21-27°C) and water temperatures approximately 65-75°F (18-24°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!