The market's overwhelming consensus on a 30°C high in Busan today stems from Korea Meteorological Administration forecast models and global ensembles projecting a precise daytime maximum under southerly flow advecting warmer air masses across the Korean Peninsula. Current observational data from coastal stations show temperatures tracking steadily toward this threshold amid stable high-pressure conditions and typical mid-May sea-breeze moderation that prevents excessive warming. This positioning aligns with historical climatology for the region, where peaks often settle near 29–31°C before coastal influences cap further rises. Minor deviations in cloud cover timing or breeze strength remain the primary variables that could realistically shift the observed high, though model agreement currently leaves scant probability for outcomes outside this narrow band.