Current forecasts from multiple models indicate Incheon’s minimum temperature on September 14 will most likely fall in the 18–21 °C range under partly cloudy skies and light northwest winds, with radiative cooling overnight tempered by residual moisture and weak mixing. Trader sentiment remains evenly split between the sub-15 °C and 24 °C+ bins because small shifts in cloud cover, wind speed, or the timing of any frontal passage can easily move the overnight low by 3–5 °C, while the broader seasonal transition from summer warmth keeps both cooler and warmer outliers plausible. Official guidance from agencies such as the Korea Meteorological Administration shows stable high pressure dominating, yet ensemble spreads highlight genuine uncertainty in boundary-layer conditions that will be clarified by updated model runs over the next 48 hours.