I freely admit it. Landmarks are lovely, but I also enjoy observing others interacting with their surroundings. And, I like to do my people-watching with my camera at the ready.
Paris in September requires a full suitcase. You could as easily be fumbling for a warm winter jacket as a sundress -or searching out a warm latte versus a refreshing gelato. The weather seems to fluctuate along with the euro, bringing chilly rain some years and summer sun in others. When I last visited, a long stretch of warmth filled the benches and lawns and Seine River quays with Parisians simply enjoying their city. Weekend or work day, we found masses of people savoring the sunshine and delights of outdoor Paris.
While I would have enjoyed the city in any weather, but warmer temperatures seemed to entice more Parisians outdoors, allowing us to soak in a little more Paris energy along with the sun.