**Persistent dominance of the North Pacific high-pressure system is sustaining hot, humid conditions across southern South Korea into late August 2026, driving trader expectations toward peak temperatures of 35–36°C in Busan on August 25.** Official forecasts and recent Korea Meteorological Administration guidance indicate daytime highs of 31–35°C nationally, with Busan (influenced by maritime air but still under the high’s edge) likely seeing strong solar heating under mostly clear to partly cloudy skies, light southerly or variable winds, and high humidity that limits nighttime cooling but supports daytime maxima. Historical August averages near 29.5°C and records up to 37.3°C provide context, but the current pattern—marked by expanded subtropical high influence and minimal frontal activity—has produced consecutive days above 32°C, with sensible temperatures often exceeding actual readings. The tight clustering between 35°C and 36°C reflects uncertainty in fine-scale factors such as exact cloud fraction, boundary-layer mixing, or minor steering shifts that could add or subtract 1–2°C. Model consensus remains stable for the immediate period, though updated runs and any localized shower development could refine outcomes before resolution. Traders are weighting the established heatwave persistence more heavily than longer-term seasonal decline.