**Official forecasts from the Hong Kong Observatory indicate mainly cloudy skies with occasional showers and squally thunderstorms on August 31, limiting daytime heating and supporting a maximum near 30°C.** A broad low-pressure trough over the northern South China Sea sustains high humidity (75–95%) and cloud cover, reducing solar insolation while scattered convection and evaporative cooling from rainfall further suppress peaks. Winds shifting to easterly or southeasterly may advect marginally cooler maritime air, consistent with a cooling trend from recent 32–33°C readings. This pattern aligns with the market’s leading 30°C (33%) and 29°C (26.5%) outcomes, though modest spread in ensemble guidance leaves room for 31–32°C if showers prove less widespread. New HKO updates or refined model runs ahead of the date remain the key near-term catalysts.