For the young folks, September is the worst month amongst the twelve. Summer vacation ends and school starts on September 1. The young energes the city - restaurants have more activities, housewlves got busy again for their kids' going to school. Traffic gets jammed by school-uniform.
Weather becomes cooler and rain is becoming rarer. Mooncake ads are all hovering over the city. We know autumn is just around the corner.
All these are happening in the month of September.