Recent Korea Meteorological Administration model runs projecting a 34°C peak have been offset by cooler ensemble guidance and coastal sea-breeze moderation typical for Busan, keeping trader focus tightly split between 30°C and 31°C. Afternoon cloud development, variable wind patterns under the North Pacific High, and lingering humidity from the summer monsoon create a narrow 1–2°C uncertainty band around the most likely maximum. Historical August climatology for Busan centers on 29–31°C highs, reinforcing the current market clustering while leaving room for slight upward revision if clear skies persist through peak heating on the 12th.