Persistent cloud cover, showers, and thunderstorms expected across Hong Kong on September 1 are limiting solar heating and keeping maximum temperatures in the 28–29°C range, aligning with the market’s heaviest positioning on those outcomes. Official forecasts from sources including the Hong Kong Observatory and multiple models highlight northeast winds, high humidity near 80%, and a 50–70% chance of rain or storms that suppress afternoon peaks, consistent with observed readings near 27–28°C late on August 31. While some guidance notes brief clearing potential that could allow a brief spike toward 30°C, the dominant consensus favors subdued maxima below the early-September climatological average near 30–31°C. Updated model runs and real-time observations through the morning will determine whether any late-day warming shifts probabilities.