Forecasts from the Hong Kong Observatory and global models indicate mostly cloudy skies with scattered showers and thunderstorms on August 31 driven by a broad low-pressure trough over the northern South China Sea. These conditions reduce solar insolation and promote evaporative cooling, anchoring daily maxima near 29–31 °C—consistent with August climatology but tempered by high humidity (80–95 %) and light variable winds. Model runs show limited disagreement, with ensembles clustering in this narrow range. Traders have priced 30 °C (34 %), 29 °C (33 %), and 31 °C (25 %) as the leading outcomes, reflecting the tight consensus on modest day-to-day variability under persistent moisture and weak steering flow.