Recent Korea Meteorological Administration forecasts and ensemble models highlight afternoon showers with 60% precipitation probability as the dominant driver for August 17 in Busan, where typical late-summer highs under North Pacific High influence range 29–32°C but cloud cover and evaporative cooling from rain can suppress peaks by several degrees. This produces tight market clustering around 27–29°C, with 28°C leading at 32.5% implied probability as traders weigh partial clearing scenarios against sustained convection. Coastal sea breezes and humidity further moderate extremes, while model spread on shower timing and intensity creates the observed uncertainty ahead of updated short-range guidance.