Recent forecasts from the Korea Meteorological Administration (KMA) and other models indicate fair to mostly sunny conditions for Seoul on June 26, 2026, with daytime highs centered around 28–30°C under building high pressure and light winds. This setup favors radiative warming during peak solar heating hours, though increasing humidity and the early influence of the East Asian monsoon could cap the maximum through enhanced cloud cover or brief showers. Model consensus shows minor spreads due to uncertainties in boundary-layer mixing and exact timing of any sea-breeze effects from the Yellow Sea, keeping the highest temperature most likely in the narrow 26–27°C window that dominates trader pricing. Historical late-June climatology for Seoul supports highs near 28°C as a baseline, but the current stable pattern reduces downside risk from rain-cooled scenarios while limiting upside beyond 29°C without stronger subsidence. Updated KMA guidance and ensemble runs ahead of resolution will be the key inputs for any late shifts in market-implied odds.