Ongoing heat across the Korean Peninsula, with official Korea Meteorological Administration observations showing recent nighttime lows near 27–29°C amid record daytime highs, underpins the tight market clustering around 27–28°C for Seoul/Incheon’s August 8 minimum. Persistent high pressure, elevated humidity, and limited nocturnal radiative cooling keep overnight temperatures elevated, while ensemble guidance from regional models shows modest spread in cloud cover and boundary-layer mixing that could nudge the low by 1–2°C. Historical August climatology places typical Incheon minima near 23–25°C, so the current pattern represents a clear warm anomaly that traders are pricing through the resolution criteria of the official 3–9 a.m. observation window.