Recent forecasts from multiple models indicate a minimum temperature near 19°C in Busan on September 21 under clear skies and northerly flow, consistent with seasonal norms for late September. The closely matched market-implied odds around the 13°C-or-below and 23°C-or-higher brackets, alongside 20-22% probabilities for specific values near 17-22°C, reflect trader focus on remaining uncertainty in the precise overnight low. Key variables include slight model disagreements on boundary-layer cooling rates, wind speeds near 10-15 mph that could limit radiative cooling, and any last-minute shifts in high-pressure positioning. Updated short-range model runs and local observations over the next 12-18 hours will likely refine the expected minimum before resolution.