Recent Korea Meteorological Administration forecasts place Seoul’s May 17 maximum at 24–25 °C under a strengthening high-pressure ridge that favors subsidence, clear skies, and modest southerly warm-air advection from the Yellow Sea. This setup has lifted readings a few degrees above the mid-May climatological average of 22–23 °C, aligning closely with the market’s heavy weighting toward 25 °C while leaving limited room for 26 °C or higher. Official guidance shows strong model consensus on limited daytime heating and light winds, reducing the chance of notable upward spikes. Traders monitoring the final afternoon observations from the Seoul station can expect resolution once the day’s peak is confirmed against these thresholds.