**Official forecasts from the Korea Meteorological Administration and aligned international models indicate a maximum temperature of 21°C in the Seoul-Incheon area on October 1, 2026, under mostly clear skies with moderate northwest winds.** This consensus, reflected in the market's 97.5% implied probability for 21°C, stems from stable high-pressure conditions and observed afternoon readings near 20–21°C. Historical early-October averages for the region hover around 20–22°C, providing climatological support. Minor deviations remain possible if late-day cloud cover or wind shifts alter local heating, though current model runs show limited divergence and resolution is imminent.