Forecasts for Busan on October 13 indicate a frontal passage with thunderstorms and southwesterly winds during the day, followed by clearing skies and a shift to northwesterly flow overnight. This pattern promotes radiative cooling under reduced cloud cover, with model consensus pointing to minimum temperatures near 17–19°C (62–66°F) depending on the exact timing of clearing and sustained wind speeds. Historical October averages hover around 16°C, but current guidance shows slightly milder conditions due to residual warmth and variable humidity. Trader odds cluster tightly around 17–20°C because small differences in post-frontal clearing or boundary-layer mixing could shift the overnight low by 1–2°C, while extremes remain improbable given the moderate air mass. Updated model runs and observational data from the Korea Meteorological Administration will refine these projections ahead of market resolution.