San Marino in September

April through October gives you the best weather for exploring San Marino's outdoor sights. The mountain location means temperatures run about 5°C cooler than the Italian coast below, making summer visits more comfortable than you'd expect. May and September hit the sweet spot — warm enough for t-shirts during the day, cool enough for comfortable walking, and fewer crowds than peak summer. The Tre Cime towers stay open until 8 PM during these months, giving you golden hour photography opportunities. July and August bring the biggest crowds, especially Italian families on beach holidays making day trips up the mountain. Expect lines at the cable car and packed restaurants during lunch hours. But the extended daylight hours (sunset after 8 PM) give you more time to explore. Winter visits work if you don't mind shorter days and occasional fog that can obscure the countryside views. Most outdoor restaurants close, and the cable car runs reduced hours. But you'll have the medieval streets mostly to yourself, which has its own appeal.