Current forecasts from multiple models indicate a minimum temperature near 27–28°C for Guangzhou on September 29, driven by light southwesterly winds, partly cloudy skies, and high humidity that limits nocturnal radiative cooling under subtropical high pressure. Historical September averages show lows around 23°C, so the projected warmth reflects persistent warm advection and minimal cloud-free radiational cooling windows. Scientific uncertainty remains elevated because small shifts in overnight cloud cover, dew point depression, or weak frontal passages could alter minimums by several degrees; ensemble spreads in global models highlight this variability ahead of resolution. Traders appear balanced between scenarios of enhanced cooling to 22°C or below versus sustained warmth near or above 32°C as new runs and official China Meteorological Administration guidance approach.