Recent official forecasts from agencies and models indicate Busan will experience mostly clear skies and light westerly winds on October 5, supporting a daytime maximum near 24–25°C under building high pressure. This setup favors radiative heating after cooler overnight lows around 17°C, pushing the daily high modestly above early-October climatological averages of 22–23°C. Trader emphasis on 25°C and 26°C reflects the tight clustering of ensemble guidance around these values, with limited upside risk from stronger warming or downside from cloud cover. Updated model runs and Korea Meteorological Administration briefings over the next 48 hours will refine the exact peak and inform any shifts in implied probabilities.