Official Hong Kong Observatory temperature readings and regional station data confirm an overnight minimum near 28°C across urban and airport sites, consistent with the prevailing warm, humid air mass under a broad low-pressure trough bringing light west-southwesterly winds and scattered showers. This keeps surface temperatures elevated overnight, with dew points near 26°C limiting radiational cooling and preventing drops to 27°C or below. Model guidance and climatological August baselines align with this range, supporting the market's 99.9% implied probability for 28°C as the daily low. A sudden, unforecasted surge in onshore flow or heavy localized rain cooling could theoretically push readings lower, though current observations and short-term forecasts indicate low likelihood before the calendar day ends.