Recent numerical weather prediction ensembles from the Korea Meteorological Administration and international models indicate a likely daily maximum of 24–25°C in Seoul on June 12, underpinning the tight market clustering around those outcomes. Early June conditions feature moderate warming under partly cloudy skies as the region transitions from spring patterns, with daytime heating tempered by residual moisture and light winds typical of the pre-monsoon period. Ensemble spread arises from minor differences in cloud cover timing and boundary-layer mixing, which can shift the peak by 1°C. Historical climatology places early-June highs near 25–27°C, providing context for the current consensus while underscoring sensitivity to short-term atmospheric variability ahead of final observations.