**Persistent cloud cover, widespread showers, and elevated dew points around 24–25°C are the dominant factors limiting overnight radiative cooling in Hong Kong on September 1, 2026, keeping the minimum temperature most likely near 25–26°C.** Forecasts from multiple sources, including the Hong Kong Observatory and international models, indicate overnight lows of approximately 25–27°C under mostly cloudy to overcast skies with northeasterly winds of 10–20 km/h and scattered thunderstorms. These conditions suppress the clear-sky radiative heat loss that would otherwise allow temperatures to drop further, aligning with early-September climatology where average minima hover near 26°C. High humidity (often 85–95%) and warm sea-surface temperatures in the northern South China Sea further anchor nighttime readings. Market-implied probabilities reflect this consensus: the 58.5% chance for 26°C and 25% for 25°C capture the narrow range supported by current model runs, while lower probabilities for 24°C or below (under 10% combined) reflect limited scope for stronger cooling without a significant change in steering flow or clearing skies. No major tropical cyclone or cold-surge developments are currently influencing the region, and updated forecasts through the day will provide the final data for resolution.