Recent Korea Meteorological Administration forecasts point to an overnight low near 24–25°C in Incheon on August 18, driven by clearing skies after earlier showers that favor radiative cooling under light winds and moderate humidity. Surface high pressure building from the northwest is expected to limit moisture influx while allowing temperatures to fall toward the dew point overnight, though residual summer warmth and urban heat-island effects in the Seoul metro area cap further drops. Model consensus shows limited variability across guidance runs, with historical August climatology placing typical minimums around 23°C, supporting the tight clustering of market-implied probabilities between 23°C and 26°C. Updated model guidance and official KMA briefings in the next 24–48 hours remain the key data points that could shift trader positioning.