Current forecasts from multiple models indicate Guangzhou's overnight low on September 26 will likely settle near 26–27°C under clear to partly cloudy skies and light southerly flow, driven by typical late-September subtropical conditions with high humidity limiting radiative cooling. Trader sentiment remains split because small differences in cloud cover, dew points near 23°C, or urban heat island effects could shift the minimum by 1–2°C, while the 45% implied probability on 20°C or below reflects lingering model spread and historical September variability around the 23°C climatological baseline. Resolution depends on official station readings after midnight local time.