Recent numerical weather prediction runs from global models indicate a likely overnight minimum near 24°C in Busan on September 4, driven by persistent northeasterly winds of 10–20 mph that advect cooler maritime air while limiting radiative cooling under partly cloudy skies. This aligns with the seasonal transition as the East Asian monsoon weakens, producing typical early-September dew points around 18–20°C and humidity dropping below 70 percent at night. Ensemble guidance shows low spread, with only modest potential for 25–26°C if cloud cover increases or 23°C if winds strengthen further; no tropical systems or anomalous blocking patterns are forecast to alter the trajectory before resolution. Updated model cycles from agencies like the Korea Meteorological Administration will refine these probabilities ahead of the observation window.