Plentzia, Spain offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Plentzia, Euskadi, Spain, is known for its picturesque Plentzia Beach and the historic Plentzia Bridge. The best time to travel to Plentzia, Spain, is from June to September, when the average air temperature is around 22°C (72°F) and the water temperature is approximately 20°C (68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!