Latest ensemble forecasts from regional numerical weather prediction models indicate the overnight low in Incheon most likely settling at 18–19°C under partly cloudy skies and light easterly flow, aligning with the near-even trader-implied probabilities at those levels. Stable high-pressure conditions and moderate humidity have kept diurnal ranges typical for mid-September, with official guidance showing minimal spread across model runs. Slight variations in cloud cover timing or wind shifts could nudge the exact minimum toward 17°C or 20°C, though probabilities drop sharply outside that band. The market will resolve on the official Incheon station observation, where small observational timing differences often separate adjacent outcomes in these tightly contested temperature markets.