**Forecast models and observational trends position 27–29°C as the dominant range for Busan’s June 15 high.** As of June 14, short-range guidance from sources including the Korea Meteorological Administration, BBC Weather, and AccuWeather consensus shows daytime maxima of 26–28°C under sunny intervals or partly cloudy skies, with light southerly or easterly winds and minimal precipitation risk. Busan’s coastal setting on the southeastern peninsula introduces a moderating marine influence that typically caps early-June peaks several degrees below inland locations, aligning with historical climatology where mid-June averages hover near 26°C. Recent model runs have remained stable, showing no significant warm advection or clear-sky amplification that would push readings into the low 30s. Trader-implied probabilities—led by 28°C (38.5%) then 29°C (24.5%) and 27°C (23.5%)—closely track this narrow envelope of official and ensemble forecasts. The low odds on 30°C+ or sub-26°C outcomes reflect both the absence of anomalous synoptic patterns and the tight uncertainty range typical of a 24-hour forecast horizon. Updated KMA or global model guidance on the morning of June 15 will serve as the primary catalyst for any final shifts in market pricing.