**Trader sentiment for Seoul's July 10 maximum temperature remains closely divided among 27–30°C outcomes because short-range numerical weather models show modest spread amid ongoing East Asian monsoon (Jangma) conditions.** Persistent high humidity, variable cloud cover, and scattered thunderstorms—already evident in early July patterns—can suppress peak heating by limiting insolation or enhance it during brief clear intervals, with the precise timing and intensity of rain bands determining whether the daily high reaches the upper or lower end of the 26–31°C envelope. Official guidance from the Korea Meteorological Administration (KMA) and ensemble forecasts highlight typical July variability around 28–30°C baselines, while Seoul’s urban heat island adds a small upward bias. The balanced probabilities mirror genuine forecast uncertainty two days out, with model updates and any revised precipitation timing expected to drive further market adjustments before resolution.