Trader sentiment for Busan’s August 12 high centers on the North Pacific High sustaining warm, humid southerly flow while Busan’s coastal setting introduces sea-breeze moderation. Korea Meteorological Administration guidance and regional models indicate a 26 °C overnight low and potential afternoon peaks near 33–34 °C inland, yet persistent easterly winds and increasing afternoon cloud cover typically limit coastal maxima 2–4 °C lower. Historical August climatology (29–31 °C) and recent observations under similar setups reinforce clustering around 30–32 °C. The tight 29.5 % shares on 30 °C and 31 °C reflect this narrow uncertainty band, with any shift in cloud timing or breeze onset able to swing the official reading by 1–2 °C before resolution.