Recent short-range forecasts from the Korea Meteorological Administration indicate a stable spring pattern over Seoul, with overnight radiative cooling under partly cloudy skies likely to produce a minimum temperature of 16–18°C on May 19. Ensemble guidance shows modest spread driven by uncertainties in low-level wind speeds and cloud timing, which can alter cooling rates by 1–2°C. This range aligns closely with mid-May climatology, where average lows have risen from 13°C in recent decades due to broader seasonal warming, yet no strong frontal system is expected to disrupt the typical diurnal cycle. Traders are weighting the 16°C outcome most heavily because current model consensus clusters there, while slightly warmer or cooler scenarios remain plausible if wind or moisture shifts develop in the final 48 hours.