**Persistent easterly airflow and stable subtropical conditions have kept Hong Kong's overnight temperatures anchored near 26–27°C on October 15, 2026, producing the market's overwhelming 98.1% implied probability for a daily low of exactly 26°C.** Hong Kong Observatory forecasts issued that morning projected a minimum of 27°C under partly sunny skies with light easterly winds of force 4–5, consistent with regional model guidance showing limited radiative cooling and dew points in the low 20s. Historical October climatology for the territory supports similar nighttime floors when the monsoon trough remains suppressed. Only a sharp, unforecast increase in cloud cover or a transient surge of cooler air from the northeast could realistically push the official reading to 25°C or below, an outcome the market currently prices below 1%.