Recent KMA and international model runs for coastal Busan project a daytime maximum near 32–33 °C on August 23 amid the post-heatwave pattern, with limited daytime heating expected under mostly cloudy skies and light southerly flow. Sea breezes off the East Sea and residual moisture from the weakening monsoon typically cap peaks 1–2 °C below inland forecasts, while urban heat-island effects in the city center can add a fraction of a degree on clearer afternoons. The tight clustering of market-implied odds on 33 °C and 34 °C reflects this narrow ensemble spread and historical August variability, where a single hour of stronger insolation or delayed cloud build-up can shift the official daily high by 1 °C. Updated KMA short-range guidance and any late-model shifts in precipitation timing remain the key near-term catalysts.