Paris & Île-de-France in September

April through June is peak Paris. Mild weather, long days, and everything's open. But expect crowds and higher prices, especially during May school holidays. September and October give you perfect weather without summer crowds. Restaurant terraces stay open, museums are manageable, and you get those golden autumn photos everyone posts. Winter (December-February) is dark and rainy, but also magical. Christmas markets, fewer tourists, and cozy café culture at its peak. Many restaurants close for vacation in August, so avoid that month if food is your priority. Here's the thing about Paris weather: it changes fast. Pack layers always. That sunny morning can turn into a rainy afternoon, and Parisians will judge your soggy tourist look.