Clear, calm conditions under a strong high-pressure system have driven overnight radiative cooling across Busan, positioning the lowest temperature near 12°C according to official Korea Meteorological Administration monitoring. Multiple forecast models show nighttime lows stabilizing in the 11–14°C range, with minimal cloud cover and light winds favoring the lower end of that band. Trader consensus at 95.5% implied probability for exactly 12°C reflects this model agreement and historical autumn patterns in the region. A late surge in marine air or unexpected cloud development could push readings slightly higher, while stronger radiative cooling under perfectly clear skies remains the main risk for a lower outcome. Updated KMA observations will confirm the final figure.