A broad low-pressure trough over the South China Sea is driving unsettled conditions across Hong Kong on August 31, with official Hong Kong Observatory forecasts calling for mostly cloudy skies, scattered showers, and thunderstorms that should limit solar heating and cap the daily maximum near 30°C. Recent model consensus and climatological patterns for late August support this, as persistent moisture and convective activity often suppress peaks by 2–4°C compared to clearer days. Market-implied odds cluster tightly around 29–30°C because forecasters and traders weigh variable rain timing and intensity, which can shift observed highs by a degree or two; stronger or earlier storms favor the lower end while any afternoon clearing could push toward 31°C. Updated HKO briefings and regional model runs over the next 48 hours will provide the key data for resolution.