**Forecast uncertainty around cloud cover and light precipitation is keeping trader probabilities tightly clustered among 28–30°C for Wuhan's maximum temperature on September 27.** Multiple official and ensemble forecasts show highs in the 29–31°C range under persistent overcast skies and scattered showers, with northerly winds strengthening as a cold front approaches from the north. These conditions limit surface heating by reducing incoming solar radiation and enhancing evaporative cooling, while historical late-September averages near 28–29°C provide a climatological baseline. Slight model differences in timing of any partial clearing or rainfall intensity explain the near-even odds between 28°C and 29°C. Updated runs from the China Meteorological Administration ahead of the date will likely sharpen resolution criteria.