**Recent official forecasts position 25°C as the leading outcome for Hong Kong’s minimum temperature on August 4.** The Hong Kong Observatory’s latest guidance projects a daily minimum of 25°C and maximum of 30°C under a regime of showers and high humidity, aligning closely with the market’s 58.5% implied probability for 25°C and 27.5% for 26°C. Summer monsoon conditions over the South China Sea, combined with lingering low-pressure troughs, favor widespread cloud cover and scattered rainfall that suppress daytime heating and limit nighttime radiative cooling. Historical climatology shows early-August overnight lows typically range from 25–28°C, and current model consensus supports values near the lower end of that band due to enhanced moisture and reduced insolation. No major tropical cyclone threats or abrupt shifts in steering flow appear imminent in the next 48 hours, keeping the distribution tightly centered on 25–26°C. Traders are therefore weighting the official forecast heavily while assigning modest probabilities to slight deviations from model spread or localized urban heat-island effects. Updated HKO guidance and regional model runs in the coming day will provide the next high-impact data points for market resolution.