**Market-implied odds center on 27–29°C highs for Busan on June 16, driven by typical mid-June conditions in the region’s maritime climate.** Busan’s coastal location on the southeastern Korean Peninsula moderates temperatures through the influence of the East Sea, limiting daytime maxima compared with inland areas during early summer. Seasonal warming from solar insolation is underway, but persistent marine air and increasing cloud cover associated with the approaching East Asian monsoon (Jangma) often cap peaks in the mid-to-upper 20s °C. Current short-range guidance from Korean Meteorological Administration-aligned sources and extended forecasts show expected highs near 26°C on the 16th, with moderate humidity and a chance of showers that further suppress maximum temperatures through reduced insolation and evaporative cooling. No heatwave or anomalous high-pressure setup is indicated, keeping the probability of 30°C or above low. Traders appear to assign the highest weight to 28°C because historical analogs and model consensus place the most likely outcome just above the seasonal average of ~24–26°C for mid-June, while allowing a modest upside from clearer intervals. The next official updates from the Korea Meteorological Administration and refined numerical weather prediction runs over the next 48 hours will be the key catalysts for any shift in these implied probabilities.