Latest ensemble forecasts from global models like ECMWF and GFS, corroborated by Korea Meteorological Administration updates, point to a Seoul high of around 15°C on March 27, driving trader consensus toward that outcome at 18% implied probability while favoring 16°C or higher at 30% amid mild southerly flows. High uncertainty stems from volatile spring jet stream patterns and potential cold air intrusions from Siberia, with model spreads of 3-5°C reflecting ensemble divergence. Historical March 27 highs average 12°C (1981-2010 baseline), but recent warm anomalies boost upside odds; key variables include high-pressure ridging persistence, urban heat island effects, and preceding wind regimes, with final KMA outlook due 24 hours prior influencing late shifts.