**Current official guidance from the Hong Kong Observatory points to a minimum temperature of 27–31 °C on August 23 under mainly cloudy skies with scattered showers and southwesterly winds of force 4.** This setup favors limited nighttime radiative cooling because persistent cloud cover traps heat near the surface while moderate humidity and light winds reduce the potential for stronger drops. Global model consensus and recent analogous days align closely with this range, placing the most probable outcomes near 26–27 °C. The tight clustering of market-implied probabilities across 25–27 °C (collectively over 89 %) reflects genuine forecast uncertainty in the precise overnight minimum. Small differences in cloud thickness, shower timing, or wind gusts can shift the low by 1–2 °C: clearer breaks would allow more cooling toward 25 °C, while steadier cloud or earlier rain would hold temperatures near or above 27 °C. Historical August climatology shows typical minima around 26–27 °C, providing a baseline that traders weigh against the latest model runs. No major synoptic disruptions such as typhoons are indicated in the current outlook, keeping the distribution narrow and sensitive to the next 48-hour forecast updates.