The overwhelming trader consensus at 99.8% implied probability for a 14°C low in Seoul on May 16 reflects converging short-range forecasts from the Korea Meteorological Administration and European Centre for Medium-Range Weather Forecasts ensemble models, which settled on an overnight minimum of exactly 14°C. Mostly clear skies combined with light southerly winds enabled efficient radiative cooling and limited urban heat retention, aligning with mid-May climatological norms where official Seoul Central Observatory records typically show lows between 12°C and 16°C. Recent drier air following earlier precipitation further supported this trajectory. A significant last-minute model revision or localized microclimate shift remains the only realistic scenario that could move the outcome outside the narrow 14°C band before final resolution.