Bayona, Spain offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Bayona is known for its beautiful beaches and historic sites, including the Monterreal Fortress. The best time to travel to Bayona, Spain, is from late spring to early autumn (May to September), when the average air temperature ranges from 18°C to 25°C (64°F to 77°F) and the average sea temperature is around 16°C to 20°C (61°F to 68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!