**Trader sentiment for Hong Kong's August 9 minimum temperature reflects substantial short-range forecast uncertainty two days out, with the market spreading probability across 27–30 °C and 28 °C holding a modest lead.** The Hong Kong Observatory's 9-day guidance currently points to a 29 °C overnight low under the influence of Tropical Cyclone Dolphin's outer subsiding air, favoring generally fine, hot conditions with reduced cloud cover and limited nocturnal cooling. Key variables include the strength and timing of any remaining moisture from the South China Sea trough, which could increase cloudiness or isolated showers and lower the minimum by enhancing radiative cooling; conversely, stronger subsidence or lighter winds would limit mixing and push readings toward 29–30 °C. Climatologically, August overnight lows average near 26–28 °C, so deviations hinge on precise boundary-layer humidity, urban heat-island effects at the official station, and model consensus shifts in the next 48 hours. This distribution captures the inherent variability in tropical maritime air-mass modification and the rapid evolution possible near active weather systems.