**Current meteorological forecasts for Busan on September 18 indicate a minimum temperature near 22°C, driven by persistent northeasterly winds and extensive cloud cover associated with showers.** Official guidance from sources like the Korea Meteorological Administration equivalents and global models shows NE flow at 15–20 km/h moderating overnight radiative cooling, with 50–80% rain probability keeping dew points elevated around 20–21°C and suppressing the typical diurnal drop. This setup aligns with late-summer maritime air masses rather than clear-sky cooling that could push readings to 17°C or below. Model consensus remains tight on the central tendency near 22°C, though minor shifts in precipitation timing or wind strength could alter the exact low by 1–2°C. The market’s near-even split between the 17°C-or-below and 27°C-or-higher tails reflects trader caution around these edge cases, given historical September lows averaging near 19°C and the short forecast horizon before resolution. Updated model runs and local observations in the next 24–48 hours will likely refine probabilities around the 21–23°C range.