Recent Hong Kong Observatory guidance and ensemble models point to a maximum of 31–32°C on September 7 under generally cloudy skies with isolated showers and light variable winds, producing the tight 35–37% market shares for those two outcomes. Persistent high humidity near 70–90% and reduced solar insolation from cloud cover limit daytime heating compared with clearer September climatology, while any earlier or heavier rain could cap readings near 30°C. A strengthening high-pressure ridge and approaching northeast monsoon flow introduce modest uncertainty in cloud timing and boundary-layer mixing, keeping the 33°C+ tail probabilities low. Updated HKO briefings and afternoon model runs over the next 48 hours will refine these thresholds ahead of market resolution.