**Trader sentiment on Busan’s August 23 minimum temperature reflects substantial forecast uncertainty driven by the approaching Typhoon SAUDEL and variable cloud/rain patterns.** Short-range guidance from the Korea Meteorological Administration currently points to a minimum near 23°C under mostly cloudy skies, consistent with late-August climatology where overnight lows typically range 22–25°C due to high humidity and marine influence from the East Sea. However, SAUDEL’s projected intensification and northwestward track could enhance onshore flow, increase cloud cover, or deliver scattered showers—factors that moderate radiational cooling and keep the minimum in the mid-20s°C. Conversely, clearer breaks between rain bands or stronger mixing might allow slightly higher minima near 26–27°C, while any unexpected northerly flow or heavier precipitation could push readings toward 21–22°C. With multiple global and regional models diverging on exact timing and intensity of impacts over the next 48 hours, traders see roughly equal implied probabilities clustered around 24°C and 27°C, underscoring the sensitivity of minimum temperature to small changes in boundary-layer moisture and wind regime ahead of the typhoon’s arrival. Updated KMA and ensemble model runs expected in the coming day will likely tighten the range.