**Recent official forecasts from the Hong Kong Observatory and multiple meteorological models point to a minimum temperature of 25–26°C on September 5, 2026, driving the market’s top two outcomes (26°C at 37.5% and 25°C at 25.5%).** Persistent cloud cover, scattered showers, and high humidity—tied to lingering monsoon influences and nearby tropical moisture—are moderating overnight cooling and keeping lows in this narrow band. Model runs and observational trends show typical early-September conditions: daytime highs near 30–31°C with frequent convective activity preventing strong radiational cooling at night. This aligns with climatological baselines where September minima average around 25°C, and current steering patterns favor continued unsettled weather rather than a drier, clearer spell that could push the low toward 27°C or higher. Lower-probability outcomes like 24°C (17.5%) remain plausible if heavier overnight rain enhances cooling, while extremes below 23°C or above 28°C carry low implied odds due to the absence of significant cold-air intrusions or prolonged clear skies in the latest guidance. Traders appear to be weighting the consensus forecast range most heavily ahead of the final observation window.