Isla Plana, Spain offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Isla Plana is known for its beautiful beaches and archaeological sites. The best time to travel to Isla Plana, Spain, is from May to September, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 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!