Penzance, United Kingdom offers 12 beaches perfect for sunbathing, surfing, swimming, and more. Penzance is known for St Michael's Mount, a tidal island with a medieval castle and church. The best time to travel to Penzance, United Kingdom, is from June to September, when the average air temperature is around 15-19°C (59-66°F) and the water temperature is approximately 15-17°C (59-63°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!