**Trader consensus has converged on 16°C as the lowest temperature recorded at Incheon International Airport on September 15, 2026, reflecting near-certainty in official forecasts and early observations.** Clear skies under high pressure, light northeasterly winds, and typical mid-September radiative cooling overnight produced a minimum near 15–16°C, consistent with National Meteorological Agency guidance and model runs showing stable conditions without significant advection of warmer or colder air masses. Historical September lows for the region average around 17°C, making this reading slightly below seasonal norms but well within expected variability. Any deviation would require unforecasted cloud cover, stronger winds, or measurement adjustments at the official station, none of which appear likely given the settled pattern.