Ongoing heatwave conditions across the Korean Peninsula, sustained by a strong high-pressure ridge and predominantly clear skies, are keeping overnight lows in the Seoul-Incheon region elevated near 27–28°C and anchoring the closely matched market-implied odds for the August 8 minimum. Recent KMA guidance and ensemble model runs show limited radiative cooling overnight due to high humidity and urban heat-island effects, while a chance of isolated thunderstorms late on the 8th introduces minor uncertainty—any increased cloud cover or brief showers could shave 1°C off the low without altering the overall warm pattern. Historical August climatology for Incheon places typical morning minima around 23–25°C, so current guidance represents a notable positive anomaly; fresh short-range updates from the Korea Meteorological Administration and global models will be the next key data points likely to shift positioning between the 27°C and 28°C outcomes.