**Forecast models for Busan on June 15, 2026, center on a daytime high near 26–28°C**, with trader-implied probabilities highest for 28°C (38.5%), followed by 29°C (24.5%) and 27°C (23.0%). Coastal location in southeastern South Korea introduces maritime moderation from the East Sea, which typically caps peak temperatures a few degrees below inland areas while also limiting overnight cooling. Mid-June climatology shows rising insolation and weakening spring fronts, producing average highs around 24–26°C; current short-range guidance from sources such as AccuWeather and the Korea Meteorological Administration indicates a stable high-pressure pattern with light southerly flow, supporting modest warming into the upper 20s. Recent model runs show limited spread, with most ensembles converging on 26–27°C and only isolated warmer solutions reaching 29°C under reduced cloud cover. No strong cold-air advection or heavy monsoon rainfall is expected to suppress temperatures, yet the coastal breeze and typical June humidity keep extremes above 30°C unlikely. These conditions align with the market’s concentration around 27–29°C, reflecting traders’ assessment of the narrow but plausible range given the latest observational trends and forecast consensus.