**Recent forecasts for Incheon (Seoul's primary reference station) on September 1, 2026, center on overnight lows of 21–23°C, aligning with the market's tight clustering around 22°C (40%) and 23°C (47%).** Multiple models, including statistical outlooks and short-range guidance, show daytime highs near 28–29°C moderating under increasing cloud cover and scattered showers, which limit nocturnal radiative cooling. Minimum temperatures hinge on the timing and extent of cloud cover, boundary-layer moisture, and light southerly or variable winds that reduce heat loss after sunset. Slight model spreads arise from differences in predicted precipitation timing and dew-point depression overnight, with some guidance favoring 22°C under more persistent clouds and others 23°C if clearer breaks allow marginally greater cooling. Historical early-September climatology for the region supports this range, with average lows near 20–22°C transitioning from summer monsoon influences. Updated model runs closer to the date will likely refine the exact minimum before market resolution.