Persistent instability from a broad low-pressure trough over the Guangdong coast and northern South China Sea is the main driver, bringing increased cloud cover, scattered showers, and squally thunderstorms that limit solar heating and cap daytime maxima. Official Hong Kong Observatory guidance for August 30 projects a 27–30°C or 27–31°C range under mainly cloudy conditions with a medium-to-high rain probability, consistent with model consensus and recent observations of suppressed peaks on similar unsettled days. This aligns with trader emphasis on 29°C and 30°C outcomes, as heavier precipitation episodes and high humidity further moderate temperatures below the August climatological mean daily maximum of 31.1°C. No significant forecast revisions have emerged in the past 24 hours to shift this positioning.