Congosto, Spain offers 1 beach perfect for sunbathing, surfing, swimming, and more. Congosto, Castilla and Leon, Spain, is known for the Barcena Reservoir and the nearby Sierra de Gistredo mountains. The best time to travel to Congosto, Spain, is in late spring (May to June) when the average air temperature is around 20-25°C (68-77°F) and water temperature is approximately 18-20°C (64-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!