Dueso, Spain offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Dueso is known for its proximity to the Santoña, Victoria and Joyel Marshes Natural Park. The best time to travel to Dueso, Spain, is in late spring or early fall when the average air temperature is around 68°F (20°C) and the water temperature is approximately 64°F (18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!