Recent official forecasts from the Korea Meteorological Administration and global models indicate Busan’s September 1 overnight low will likely settle near 23–26 °C amid lingering late-summer warmth and a stagnant frontal boundary. Persistent southerly flow under the North Pacific High maintains elevated dew points and limits nocturnal radiative cooling, while scattered showers could locally enhance cooling or suppress it depending on timing and cloud cover. Model consensus shows limited spread for the daily minimum, yet small shifts in steering patterns or precipitation timing introduce genuine uncertainty across the 21–28 °C range, producing the evenly matched market-implied probabilities traders currently assign. Updated KMA guidance and next model runs within 48 hours will provide the clearest near-term signal.