Current forecast guidance from the Korea Meteorological Administration and global ensembles points to a southerly airflow advecting warmer air across the Korean Peninsula, supporting a daytime maximum near 30–32 °C in Busan on May 17. Coastal sea-breeze circulation typically moderates peak readings by several degrees in the afternoon, creating the tight clustering of market-implied odds between 31 °C and 32 °C while leaving modest room for 30 °C or 33 °C-plus outcomes. Model spread in the exact timing of onshore flow and any late-day cloud development accounts for the remaining uncertainty in the final high, consistent with historical variability for mid-May coastal stations.