Sao Jacinto, Portugal offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sao Jacinto is known for the Sao Jacinto Dunes Natural Reserve and its beautiful beaches. The best time to travel to Sao Jacinto, Portugal, is from June to September, with average air temperatures around 70-80°F (21-27°C) and water temperatures around 64-72°F (18-22°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!