Guethary, France offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Guethary is known for its picturesque Basque architecture, stunning Atlantic Ocean views, and vibrant surf culture. The best time to travel to Guethary, France, is from June to September, when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 20-22°C (68-72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!