Korea Meteorological Administration observations confirm Busan's highest temperature peaked at 23°C this afternoon under clear skies and light northerly winds, matching pre-dawn model ensembles that clustered tightly around 23–24°C for this mid-May date. The city's coastal location moderates highs via sea breezes, aligning with historical averages of 22–24°C on May 13, while current evening readings of 19°C signal rapid post-sunset cooling with no further diurnal heating possible. Trader consensus at 100% implied probability on 23°C reflects this observational lock-in, backed by real capital. Realistic challenges include a rare late revision to KMA's official daily maximum from Gimhae Airport station data or minor urban heat discrepancies, though probabilities remain negligible as resolution nears.