Traders see nearly even odds across 24–29°C lows for Hong Kong on August 12 because short-range ensemble forecasts from global models display modest spread driven by uncertain boundary-layer moisture and nocturnal cloud cover. Typical mid-August climatology features minimums near 26–28°C under the influence of the subtropical ridge and southerly flow from the South China Sea, yet a passing weak trough or increased thunderstorm activity could enhance radiative cooling and push readings toward 24°C or below. Conversely, clearer skies and stronger urban heat retention favor 29–30°C. With resolution hinging on the single lowest hourly observation at the official station, model differences in timing of any rain-cooled air mass keep implied probabilities clustered and sensitive to the next updated runs.