Official observations from the Korea Meteorological Administration confirm that the daily maximum temperature at Incheon reached precisely 25°C on September 11, 2026, aligning with multiple forecast models showing afternoon highs of 25–26°C under persistent overcast skies that suppressed further warming. This outcome matches mid-September climatology for the region, where typical highs hover near 26°C but recent cloud cover and light northerly winds kept readings capped. Trader consensus at 100% implied probability reflects the finality of recorded data, with resolution hinging on verified station maxima rather than forecasts. Minor revisions in post-processing or station-specific readings remain the only realistic paths to adjustment, though historical patterns indicate such changes are rare once preliminary values are posted.