**Recent cooling from northerly airflow after record mid-October warmth has driven strong trader consensus toward a 15°C minimum in the Seoul-Incheon area on October 13.** Official forecasts from sources including Open-Meteo and the Korea Meteorological Administration indicate daytime highs near 20–21°C under rainy or cloudy conditions, with overnight lows settling around 15–17°C as winds strengthen from the northwest. This aligns with climatological expectations for mid-October cooling following unseasonable heat, where model consensus supports a minimum near 15°C. The 92.5% market-implied probability for 15°C reflects this alignment, though slight downward revisions in final observations—possible with clearer skies or measurement timing—could still shift outcomes toward 14°C.