Tight trader consensus clusters around 12-15°C for Seoul's highest temperature on April 8, as reflected in market-implied odds, stems from Korea Meteorological Administration (KMA) medium-range guidance projecting a 15°C peak under partly cloudy skies with 40% precipitation odds and light southerly flow, tempered by recent cool, rainy conditions (current highs near 9-10°C) and model ensemble spread from ECMWF and GFS. Persistent low-level clouds from an approaching frontal system over the past 48 hours suppress insolation, favoring 12-13°C outcomes, while potential afternoon clearing and urban heat effects near Incheon International Airport—the resolution station—could push toward 15°C or higher. Early April climatology averages 14°C highs amid spring variability; new KMA short-term updates and 12Z global model runs tomorrow will clarify cloud evolution and boundary layer warming.