Recent forecast model runs from the Korea Meteorological Administration and global ensembles indicate a southerly flow advecting warmer air over the Korean Peninsula, positioning Busan’s expected daytime maximum near 29–31 °C for May 17. This places the market-implied odds for 30 °C in the lead, reflecting uncertainty in the precise peak timing and strength of the sea-breeze circulation that typically moderates coastal temperatures. Historical May averages hover around 22 °C, so current conditions represent a notable positive anomaly driven by high-pressure dominance and minimal cloud cover. Traders appear to weigh the consensus of deterministic and ensemble guidance heavily, though a modest shift in sea-surface temperatures or unexpected frontal passage could still nudge the peak outside the 30 °C bin before official observations finalize.