Recent Korea Meteorological Administration forecasts and ensemble models indicate a mostly cloudy to overcast day for Busan on August 21 with isolated showers possible, supporting highs near 30–32°C as the leading market outcomes. Persistent moisture from the North Pacific high-pressure system, combined with weak steering flows and coastal sea breezes, limits strong diurnal heating while increasing cloud cover that reduces incoming solar radiation. Any afternoon convection could further suppress peak temperatures by several degrees through evaporative cooling and reduced insolation. Historical August baselines around 29–31°C and recent heatwave moderation provide context, but small shifts in timing or intensity of cloud breaks versus precipitation will determine whether the daily maximum settles at 31°C, 32°C, or edges toward 33°C before resolution.