Tarnos, France offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Tarnos is known for its proximity to the scenic beaches of the Atlantic coast and the Basque Country. The best time to travel to Tarnos, France, is from June to September, when the average air temperature is around 70-80°F (21-27°C) and the water temperature is approximately 68-72°F (20-22°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!