Recent forecast guidance from the Korea Meteorological Administration highlights modest uncertainty in peak daytime heating for Seoul on June 18, with model consensus centering on highs of 29–31 °C amid partly cloudy skies and isolated showers tied to the advancing East Asian monsoon. Afternoon humidity near 70–80 % and light southerly flow may limit full insolation, tempering maximum temperatures toward the lower end of that range and supporting the narrow market edge for 28 °C over 29 °C. Ensemble spreads reflect typical early-summer variability in cloud timing and precipitation efficiency, while historical June climatology shows similar days resolving between 27–30 °C. Updated KMA short-range runs and observational trends through the evening of June 17 will likely refine these probabilities before resolution.