Recent Korea Meteorological Administration model runs and ensemble guidance indicate Seoul’s May 19 daytime maximum will most likely fall between 24 °C and 26 °C, driven by a persistent high-pressure ridge promoting subsidence, clear skies, and modest southerly warm-air advection across the Yellow Sea. These conditions have lifted readings modestly above the mid-May climatological normal of 22–23 °C, explaining the market’s tight clustering around 24–25 °C. Minor differences among leading outcomes reflect small uncertainties in boundary-layer mixing and the precise timing of any weak frontal passage, with new KMA updates and observational data expected to narrow the range before resolution.