Recent observational data from Busan meteorological stations show daytime temperatures climbing to a peak near 30°C under mostly clear to partly cloudy skies, light northeast winds, and low precipitation probability, aligning with the market's near-certain 30°C outcome. Model consensus from sources like GFS and ECMWF supports this maximum, consistent with late-summer patterns where September highs average 26–28°C but can reach 30°C during stable high-pressure periods. Minor forecast revisions or localized variations in urban heat islands could nudge the precise maximum, yet current station readings and model runs leave little room for outcomes below 29°C or above 31°C on this date.