Persistent extreme heatwave conditions across South Korea, with Korea Meteorological Administration warnings and daytime highs near 37°C in the Seoul-Incheon area, are elevating the market-implied odds for a 27–28°C minimum at Incheon International Airport on August 8. Strong subsidence, clear skies, and high humidity from the North Pacific high suppress nocturnal radiative cooling, keeping overnight temperatures well above the seasonal average of 22–23°C. Urban heat island effects in the densely developed corridor further limit temperature drops, as confirmed by recent KMA observations of mid- to upper-20s°C lows during the event. Model consensus and short-range forecasts show limited relief through the weekend, though any shift in steering patterns or increased cloud cover could allow greater cooling and favor the 26°C outcome. Traders are monitoring the next KMA updates and ensemble guidance for resolution criteria tied to the official morning low recorded between 3–9 a.m.