Traders see the highest temperature in Seoul on July 31 clustered around 31–33 °C because official forecasts from the Korea Meteorological Administration and global models show persistent heat-wave conditions with daytime maxima in the low 30s amid ongoing advisories for much of the country. Recent observations place Seoul near 31 °C under mostly clear skies, while typical late-July climatology and current ensemble guidance indicate modest day-to-day variability driven by humidity, possible afternoon convective showers, and subtle shifts in steering flow that can trim or boost peak readings by 1–2 °C. The tight spread across 29–34 °C outcomes reflects genuine uncertainty in model runs regarding exact cloud cover and precipitation timing within the next 48 hours, with traders weighting the skin-in-the-game consensus that conditions favor the mid-30s range yet allow for lower peaks if monsoon influences strengthen.