Hong Kong Observatory guidance and numerical weather models indicate overnight lows near 27°C for August 22 amid persistent cloud cover, scattered showers, and high humidity typical of late-summer South China Sea trough conditions. These factors suppress nocturnal radiative cooling and maintain elevated minimum temperatures, aligning with seasonal outlooks for normal-to-above-normal August readings and historical averages around 27°C. Trader sentiment clusters around 26–27°C outcomes because light easterly winds and thunderstorm activity create limited downside potential for cooler readings, while model consensus leaves room for slight variations depending on exact timing of convective activity. Updated HKO briefings and morning model runs before the 22nd remain the key near-term catalysts that could shift implied probabilities.