Korea Meteorological Administration short-range guidance has converged on a precise 24 °C daytime maximum for Seoul on May 16 under a stable high-pressure ridge that favors subsidence, clear skies, and only modest southerly warm-air advection. This setup aligns with the historical May climatology for the region, where typical highs range 22–24 °C, and current ensemble model consensus shows minimal spread around that value. The market’s 100 % implied probability for exactly 24 °C therefore reflects traders’ confidence in the official forecast and the absence of significant boundary-layer warming mechanisms. Only an unanticipated strengthening of the urban heat-island effect or a late revision in the final observational data could realistically shift the outcome toward 25 °C or higher before resolution.