Recent forecast guidance from the Korea Meteorological Administration and global models indicates daytime highs in Seoul will likely reach 24–29°C on May 18 under mostly clear to partly cloudy skies driven by a stable high-pressure ridge. These conditions suppress cloud cover and allow strong solar heating, pushing maximum temperatures above the 23°C May climatological average. With minimal precipitation expected and light winds, the primary uncertainty centers on exact timing of any afternoon cloud build-up that could cap readings near 24°C. Updated model ensembles later today will further refine land-surface heating rates and boundary-layer mixing, directly influencing whether the market-implied 62.5% probability for 25°C or higher holds.