**Trader sentiment for Busan’s August 30 minimum temperature centers on 25–27°C, reflecting a warm, humid nocturnal environment shaped by coastal moderation, persistent cloud cover, and high dew points that limit radiative cooling.** Busan’s maritime setting on the southeast coast keeps overnight lows higher than inland areas through the influence of the relatively warm East Sea waters and reduced diurnal temperature range typical of the region in late summer. Current conditions feature widespread cloudiness, scattered thunderstorms, and light southwesterly winds, which trap heat and moisture near the surface. Dew points near 24–26°C further suppress cooling, as the air mass retains warmth from recent monsoon-influenced patterns and elevated humidity (often 80–90%). Model consensus and recent observations indicate the overnight low will likely settle in the mid-20s°C rather than dropping toward seasonal norms around 23–24°C, because clear-sky radiative losses are inhibited. The tight clustering of market probabilities around 25–27°C captures residual uncertainty from small differences in cloud timing, exact wind shifts, or localized urban heat effects versus official station readings. Lower outcomes (24°C or below) remain possible only with unexpected clearing and stronger winds, while anything above 27°C would require an unusually stable warm layer persisting through the night.