Saint Valery sur Somme, France offers 1 beach perfect for sunbathing, surfing, swimming, and more. Saint Valery sur Somme is known for its picturesque medieval architecture, the Bay of Somme, and its connection to William the Conqueror. The best time to travel to Saint Valery sur Somme, France, is from June to September, with average air temperatures ranging from 60-70°F (15-21°C) and water temperatures around 60-65°F (15-18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!