Recent forecasts from multiple meteorological sources indicate Busan’s overnight low on October 3 will likely settle near 16–18 °C under building high pressure and variable cloud cover. This places the outcome near the boundary between the closely matched 9 °C-or-below and 19 °C-or-higher market options, with specific 10–18 °C bins reflecting residual model spread. Autumnal radiative cooling is moderated by the city’s coastal location, where the East Sea supplies relatively warm maritime air and limits nocturnal temperature drops. Light northerly to easterly winds and mostly clear to partly cloudy skies in the latest model runs favor modest cooling but not sharp cold-air advection. Updated ensemble guidance expected in the next 24–48 hours will clarify whether any weak frontal passage or increased cloudiness alters the minimum.