Muskiz, Spain offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Muskiz is known for the La Arena Beach and the historic Castillo de Munatones. The best time to travel to Muskiz, Spain, is from June to September, with average air temperatures around 68-77°F (20-25°C) and water temperatures around 66-72°F (19-22°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!