Silveira, Portugal offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Lisbon, Portugal, is known for its iconic landmarks such as Belem Tower, Jeronimos Monastery, and the historic Alfama district. The best time to travel to Silveira, Portugal, is from June to September, with average air temperatures around 70-80°F (21-27°C) and water temperatures around 66-72°F (19-22°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!