Saint Laurent sur Mer, France offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Saint Laurent sur Mer is known for Omaha Beach, a significant D-Day landing site during World War II. The best time to travel to Saint Laurent sur 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 60-65°F (16-18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!