San Telmo, Spain offers 1 beach perfect for sunbathing, surfing, swimming, and more. San Telmo, Asturias, Spain, is known for the San Telmo Hermitage and its scenic coastal views. The best time to travel to San Telmo, Spain, is from May to September, with average air temperatures around 75°F (24°C) and water temperatures around 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!