Fos-Sur-Mer, France offers 1 beach perfect for sunbathing, surfing, swimming, and more. Fos-Sur-Mer is known for its industrial port and the nearby Camargue Regional Nature Park. The best time to travel to Fos-Sur-Mer, France, is from June to September, with average air temperatures around 75°F (24°C) and water temperatures near 72°F (22°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!