Recent northerly cold air advection and high-pressure dominance have driven cooling across the Korean Peninsula, positioning 21°C and 22°C as the leading market-implied outcomes for Incheon’s October 2 maximum. Official forecasts from multiple models converge on a sunny day with highs near 21–22°C under northwest winds of 5–8 m/s, yielding a typical diurnal range from overnight lows around 13°C. This aligns closely with climatological norms for early October, though the recent 5°C drop from late-September values has narrowed upside potential above 23°C. Traders appear to weigh these consensus model runs against minor ensemble spread and any last-minute adjustments from the Korea Meteorological Administration ahead of resolution.