**Trader sentiment for Busan’s July 12 high centers on the stalled changma monsoon front and variable cloud cover over the Korea Strait, which currently favor a 32–33°C peak.** Official guidance from the Korea Meteorological Administration shows heat advisories active across the region amid subtropical high influence, while extended models project daytime maxima near 29–31°C with 70–85% rain probability that could suppress heating through reduced insolation. Sea-breeze advection from cooler waters often caps coastal readings 1–2°C below inland values, yet brief clearing windows allow greater surface heating and push readings toward the upper 30s. The tight 32°C (35.5%) versus 33°C (30.5%) split reflects model spread on frontal timing and precipitation intensity; stronger or earlier rainfall favors 31°C or below, while drier conditions support the higher brackets. Historical July variability in Busan (interquartile range ~27–31°C) underscores how small shifts in humidity and wind patterns can decide the outcome.