Persistent rainfall and increasing cloud cover are the main drivers keeping trader odds tightly clustered around 25–26°C for Chongqing’s September 29 high, with 26°C at 27% and 25°C at 25.5%. Official forecasts show a seasonal cooling trend as a frontal system brings light to moderate rain, limiting solar insolation and promoting evaporative cooling that caps afternoon peaks near 25–27°C. Lower outcomes like 22°C or below hold 24.5% implied probability if heavier precipitation or stronger northerly flow arrives, while 27°C or higher remain possible only if rain clears earlier than expected. Short-range model consensus from ECMWF and GFS supports this narrow range, with resolution hinging on the exact timing and intensity of showers over the next 48 hours.