Recent rain forecasts from the Korea Meteorological Administration, with 60% precipitation probability and lingering clouds on August 16, anchor trader sentiment around 28–30°C maxima for Incheon, reflecting cooling from reduced solar heating amid monsoon influences. Persistent humidity and variable steering patterns introduce model spread, as afternoon convective storms could suppress peaks below 28°C or allow brief clearing to push toward 31°C. This distribution captures inherent short-term forecast uncertainty in East Asian summer regimes, where small shifts in timing or intensity of rainfall alter daily highs relative to August climatology near 31°C. Updated model runs and KMA briefings remain key near-term catalysts.