**Trader sentiment for the lowest temperature in Busan on September 2 centers on the narrow range of 23–26°C implied by current forecasts, with 24°C holding the highest implied probability at 55%.** Coastal Busan’s overnight minimum depends primarily on radiative cooling under high humidity (typically 80–95%) and light-to-moderate winds; clear or partly cloudy skies allow greater heat loss, while increased cloud cover or a southerly flow from the ocean limits it. Model consensus points to lows near 24–26°C, with some runs showing 23°C or lower if winds calm and skies clear briefly after any evening showers. The tight clustering of probabilities around 24–26°C versus the lower odds for extremes reflects genuine uncertainty in short-term variables—wind speed, exact cloud timing, and localized sea-breeze effects—that can shift the minimum by 1–2°C overnight. Updated NWP guidance and real-time observations on September 2 will further refine these outcomes.