Recent forecasts from multiple models indicate a daily maximum temperature in Hong Kong on September 1 likely near 30°C, consistent with the market’s leading 30°C outcome at 37.5% implied probability, followed by 31°C and 29°C. Northerly winds and persistent cloud cover with scattered showers or thunderstorms are expected to limit solar heating and prevent significant exceedance of 31–32°C, while the seasonal background of above-normal warmth from an emerging El Niño supports values above the long-term early-September average of roughly 29.9°C. Official guidance from the Hong Kong Observatory aligns with this range of 27–32°C, and the tight clustering of trader probabilities around 29–31°C reflects model consensus rather than outlier scenarios. Updated runs ahead of the observation window remain the key variable that could shift odds.