Recent Korea Meteorological Administration model runs and ensemble guidance indicate a stable high-pressure system over the Korean Peninsula on May 18, with southerly flow and mostly clear skies supporting daytime maxima near 29–30 °C at the official Busan station. Coastal sea-breeze circulation, driven by the thermal contrast between the warmer land and cooler Yellow Sea waters, typically caps afternoon peaks by 1–3 °C compared to inland sites, tightening the distribution around the leading outcomes. Historical late-May climatology shows a 22–25 °C mean high with a standard deviation of roughly 2 °C, so the current setup reflects above-average warmth from the prevailing flow while still leaving room for minor model shifts in wind speed or cloud cover that could tip the recorded high between 28 °C and 30 °C.