**Trader sentiment for Hong Kong’s September 6 maximum temperature centers on 30–32°C, reflecting the Hong Kong Observatory’s 1991–2020 climatological normal of 30.7°C for that date and recent model guidance showing similar values.** Early September typically features mean maximums near 31°C under the influence of the subtropical ridge and southerly or easterly flows, with high humidity (around 80%) and frequent afternoon showers that can cap daytime peaks. Current short-range forecasts indicate mostly cloudy conditions with a high probability of thunderstorms on the 6th, which tends to limit solar heating and keep maxima close to or slightly below the seasonal average. The market’s heaviest weighting on 31°C (38.5%) followed by 30°C (28.5%) and 32°C (19.5%) aligns with this narrow range of expected outcomes, while probabilities drop sharply outside 29–33°C because departures of that magnitude would require atypical steering patterns or unusually strong insolation. No major tropical cyclone or cold-surge signals are present in the immediate period, supporting the tight clustering of implied odds around the long-term September baseline.