Trader sentiment for Seoul’s July 4 peak temperature clusters tightly around 28–29 °C because short-range guidance from the Korea Meteorological Administration and global models shows typical early-July monsoon (Jangma) conditions, with daytime maxima tempered by high humidity, variable cloud cover, and scattered afternoon showers. Southwesterly flow and urban heat-island effects keep the baseline near seasonal normals of 28–29 °C, while the precise timing and coverage of convection introduce enough uncertainty to differentiate the narrow spread among 28 °C, 29 °C, and 30 °C outcomes. Clearer breaks could push readings to 30 °C or briefly higher, whereas earlier or heavier rain would cap peaks closer to 27 °C.