Traders assign nearly equal weight to 26°C and 27°C as the lowest temperature in Hong Kong on August 15 because official forecasts from the Hong Kong Observatory and global models converge on a daily minimum near these values under persistent southwesterly flow and light rain. High humidity (70-95%) and extensive cloud cover limit nocturnal radiative cooling, preventing the temperature from dropping much below the seasonal average low of roughly 26-27°C. Recent conditions show isolated showers and stable steering patterns that maintain warm, moist air masses, with no incoming cold fronts or typhoon influences expected to alter the trajectory. Model consensus on timing of any clearer spells overnight creates the tight spread between the two leading outcomes, while probabilities below 25°C remain low given the absence of atypical cooling mechanisms. Updated short-range guidance and local observations over the next 24 hours will likely refine the exact minimum before resolution.