Current ensemble forecasts from the Korea Meteorological Administration and models such as ECMWF indicate overnight lows in Seoul and Incheon on September 8 likely ranging 15–18°C, driven by clear skies promoting radiative cooling, northeasterly winds advecting cooler air, and the seasonal transition toward autumn. This positions the 15°C-or-below outcome at 50% implied probability as traders weigh model consensus against potential revisions from updated runs or slight cloud cover increases. Historical September minima average near 16–18°C, with recent observations showing a cooling trend from mid-20s highs earlier in the week. Key upcoming data include KMA short-term briefings and refined high-resolution model outputs over the next 48 hours that could shift probabilities if dew points or wind patterns change.