**Cold continental high pressure advancing from northern China is driving a sharp cooldown across the Korean Peninsula, positioning 15°C as the leading outcome for Seoul/Incheon’s October 1 minimum.** Northwesterly winds and clear to partly cloudy skies overnight are expected to allow efficient radiational cooling, with KMA guidance and ensemble model runs converging on lows of 13–16°C. This represents a roughly 5°C drop from recent days, consistent with seasonal transition patterns. Trader consensus, reflected in the 61% implied probability for 15°C and secondary weight on 16°C, aligns with these official forecasts while accounting for minor variability from exact wind speeds or residual cloud cover. No major model disagreements have emerged in the latest runs, keeping resolution tightly clustered around the 14–16°C range.