Current numerical weather prediction models, including those from the Korea Meteorological Administration, indicate a highest temperature in Busan on August 9 most likely between 30–32°C, driven by persistent influence from the North Pacific High advecting warm, moist air masses amid typical mid-August subtropical conditions. Coastal sea breezes and variable cloud cover or isolated showers could cap daytime maxima near the lower end of that range, while clearer skies or stronger subsidence would favor 32°C or higher. This aligns with Busan’s August climatology of average highs around 30°C (84°F) but accounts for short-term model variability in boundary layer moisture and steering flow. Updated model runs and official guidance over the next 48 hours remain the key variables that could shift trader-implied probabilities among the tightly clustered leading outcomes.