Recent forecast guidance from the Korea Meteorological Administration and international models has locked in a daily maximum of exactly 25°C for Seoul on May 17, driving the market’s near-certain 100% implied probability for that outcome. Mid-May climatology typically features highs in the low-to-mid 20s under transitional spring conditions, with warm advection from the south occasionally pushing readings toward 25°C when high pressure dominates. Current observations show stable, clear skies and light winds that support efficient daytime heating without significant moisture or frontal interference. Traders are closely watching the final afternoon readings and any late-model adjustments to temperature or wind fields, as even modest deviations in the surface energy balance could shift the recorded high by one degree and alter resolution.