**Busan’s coastal location moderates peak temperatures through sea breezes and higher humidity, while clear or mostly clear conditions and light winds favor daytime heating under strong August insolation.** Official Korea Meteorological Administration guidance for August 13 points to a maximum near 34 °C with minimal precipitation risk, consistent with the broader seasonal pattern of highs typically 29–31 °C but capable of reaching the low-to-mid 30s during fair-weather periods. Multiple short-range forecasts and extended outlooks from AccuWeather and other models cluster daily maxima between roughly 30–33 °C, reflecting normal ensemble spread and the influence of any residual cloud cover or slight steering-flow variations that can shave 1–2 °C off the peak. The market’s concentration on 31–33 °C (collectively ~82 % implied probability) therefore captures both the official central tendency and the realistic range of forecast uncertainty two days out, while the modest weighting on 34 °C acknowledges the possibility of full insolation under the projected clear skies. No major synoptic shifts, such as an approaching front or typhoon influence, appear in the latest model guidance to alter this outlook before resolution.