Recent forecasts from multiple models indicate a daily minimum near 21°C in Busan on September 29 amid overcast skies, light northeasterly winds shifting easterly at 10–15 km/h, and a 20–70% chance of light rain or drizzle that could limit overnight radiative cooling. Higher probabilities clustered around 15–25°C outcomes reflect genuine uncertainty in exact minimum thresholds, driven by variable cloud cover and boundary-layer mixing rather than any major synoptic shift. Late-September climatology shows typical overnight lows of 20–22°C under similar maritime conditions, with cooler 15°C scenarios requiring stronger northerly flow or clearer skies than currently projected. Updated KMA guidance and evening model runs will refine resolution criteria tied to official station readings.