Latest ensemble forecasts from the Korea Meteorological Administration (KMA) and ECMWF models drive the neck-and-neck trader consensus for Seoul's highest temperature on March 28, with implied probabilities peaking at 28% for 18°C or higher and 27.5% for 13°C amid a broad spread reflecting atmospheric uncertainty. Historical averages hover around 13-14°C for late March, but recent model runs indicate a potential warm ridge building over the Korean Peninsula, boosted by mild Pacific air flows, could push peaks toward 18°C—contrasted by cooler GFS outliers near 12-13°C from lingering Siberian high remnants and possible cloud cover. Key differentiator: upper-level jet stream positioning, with operational updates expected by March 27 potentially sharpening odds before observation at Seoul's official stations.