Recent short-range forecasts from the Korea Meteorological Administration and global models indicate daytime highs in Busan on August 21 will likely peak between 29–32 °C, shaped by lingering late-summer warmth, elevated humidity, and scattered afternoon showers that can temporarily suppress or enhance peak readings. Model consensus points to partly cloudy conditions with light winds, keeping temperatures near seasonal norms around 30 °C while allowing brief clears that could push readings to 32–33 °C. Uncertainty stems from precipitation timing and local urban heat effects, with traders assigning roughly 77 % combined probability to the 32–33 °C outcomes as the most consistent with current ensemble guidance. Updated model runs and official KMA briefings in the next 24–48 hours will likely refine these market-implied odds.