Saint Jacut de la Mer, France offers 1 beach perfect for sunbathing, surfing, swimming, and more. Saint Jacut de la Mer is known for its picturesque peninsula, the Abbey of Saint-Jacut, and its beautiful beaches. The best time to travel to Saint Jacut de la Mer, France, is from June to September, when the average air temperature is around 60-70°F (15-21°C) and the water temperature is approximately 60-66°F (16-19°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!