Northeast monsoon flow and dry, partly sunny conditions drove Hong Kong's official highest temperature to 31°C on September 10, according to Hong Kong Observatory measurements of absolute daily maximum air temperature at headquarters. Real-time station data showed peaks near 31.5–31.9°C, consistent with the agency's forecast range of 26–32°C under easterly winds of 4–5 Beaufort and moderate humidity. This aligns with early-September climatology, where sea breezes and cloud cover typically limit daytime heating below peak summer values. Trader consensus at 100% for the 31°C bin reflects confidence that the finalized Observatory daily extract will confirm this reading. Stronger insolation or weaker winds could have pushed the official maximum to 32°C, while unexpected showers would have reinforced a lower outcome.