Shenzhen's subtropical monsoon climate produces typical late-August minimum temperatures of 26–28°C, with the market's tight clustering around 26–28°C reflecting model uncertainty in cloud cover, humidity, and sea-breeze timing for the overnight period. Coastal location near the South China Sea moderates extremes through marine influence, while urban heat-island effects and any residual moisture from recent showers can raise or suppress the low by 1–2°C. Forecasters monitor short-range ensembles for shifts in low-level wind and radiative cooling rates, as even modest increases in nocturnal cloudiness or a brief rain event could tip the reading toward 26°C or 28°C. New model runs and observational updates overnight will likely sharpen the outcome before resolution.