Recent forecasts for Busan on September 30 indicate a high near 26–27°C under clearing skies following overnight rain and easterly flow on the 29th. Southerly winds and reduced cloud cover should promote daytime heating, while modest humidity and light winds limit extreme warming. Model runs show minor spread from subtle differences in boundary-layer mixing and residual moisture, keeping the implied probability tightly split between 27°C and 28°C. Historical late-September averages near 24–25°C provide context, but current conditions support the upper end of that range. Updated guidance from the Korea Meteorological Administration will refine the peak temperature ahead of market resolution.