**Forecast models from sources including the China Meteorological Administration and global ensembles point to a minimum temperature in Guangzhou on October 6 clustered between 18–22°C, driven by clear to mostly clear skies overnight that enable strong radiative cooling under northerly flow.** Recent drier conditions following earlier showers have reduced cloud cover and humidity, allowing surface temperatures to drop efficiently while light winds limit mixing. Slight model differences in exact wind timing, dew point, and boundary-layer stability create the tight probability spread across 18–22°C outcomes, with historical October averages near 22°C providing context but current northerly advection favoring the cooler side. Upcoming model runs and official briefings will refine the precise minimum before overnight observations resolve the market.