Piran, Slovenia offers 12 beaches perfect for sunbathing, surfing, swimming, and more. Piran is known for its Venetian architecture, Tartini Square, and the Church of St. George. The best time to travel to Piran, Slovenia, is from June to September, when the average air temperature is around 25°C (77°F) and the sea temperature is approximately 24°C (75°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!