Recent short-range guidance from the Korea Meteorological Administration indicates mostly cloudy conditions with afternoon showers likely in Busan on August 21, potentially limiting peak heating under the influence of the North Pacific High and onshore sea breezes. These factors, combined with high humidity near 80-85 percent, create tight uncertainty around whether daytime maxima reach the 32–33 °C range or remain closer to 31 °C, as small shifts in cloud timing or wind direction can alter surface energy budgets by 1–2 °C. Early August heat records and persistent tropical-night patterns support trader focus on the upper end of historical coastal norms, while model consensus on precipitation probability introduces downside risk for lower outcomes.