**Trader consensus on Seoul’s July 14 overnight low centers on uncertainty in nocturnal radiative cooling amid the East Asian monsoon.** Short-range ensemble guidance from the Korea Meteorological Administration, ECMWF, and GFS indicates a broad spread of minimum temperatures, with showers and variable cloud cover expected to moderate heat retention while occasional clearer intervals allow greater cooling. Typical July climatology shows morning lows near 21–24 °C; recent model runs highlight sensitivity to precipitation timing and boundary-layer moisture, elevating the probability mass around 20 °C or below relative to warmer buckets. High humidity and the urban heat-island effect limit how far temperatures can fall, yet any organized rain band arriving before dawn could suppress the minimum. Updated KMA forecasts and the next model cycle will be the key catalysts ahead of market resolution.