Recent short-range forecasts from the Korea Meteorological Administration and global models indicate peak temperatures in Busan on June 17 likely falling between 27–30°C, driven by typical early-summer synoptic patterns with southerly flow, moderate humidity, and variable coastal sea breezes moderating extremes. Ensemble spreads and differences in timing of maximum heating explain the tight clustering of market-implied probabilities around 28–29°C, as small shifts in cloud cover or wind could tip the daily high. Historical June climatology for Busan shows average highs near 25°C with occasional warmer days, providing context for why traders assign low odds below 27°C or above 31°C absent major forecast revisions in the next 48 hours.