Seixal, Portugal offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Seixal, Madeira, Portugal, is known for its stunning natural swimming pools formed by volcanic rocks and the scenic views of the surrounding cliffs and ocean. The best time to travel to Seixal, Portugal, is from May to September, when the average air temperature is around 70-80°F (21-27°C) and the water temperature is approximately 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!