Current forecasts from the Korea Meteorological Administration and ensemble models project a maximum temperature of 26°C in Incheon on September 27 under mostly clear skies, light westerly winds, and moderate humidity, aligning with typical late-September climatology near 25–26°C. This consensus across GFS, ECMWF, and local guidance, combined with morning observations near 19–20°C and steady daytime warming, underpins the market's overwhelming 95.5% implied probability for exactly 26°C. Traders view official station readings as the resolution benchmark, though slight shifts could arise from urban heat influences in Seoul proper, precise peak timing, or minor model adjustments in final afternoon updates.