Recent forecasts from the Korea Meteorological Administration and international models indicate a daytime maximum near 27°C in Incheon on August 30, driven by persistent overcast skies, light northerly winds, and high humidity that limit surface heating despite typical late-summer insolation. These conditions produce only modest diurnal rise from overnight lows around 24–25°C, with scattered drizzle further suppressing peaks. The narrow spread between 27°C and 28°C market-implied odds reflects genuine forecast uncertainty in cloud thickness, any brief afternoon clearing, and precise steering flow that could allow marginally stronger warming. Historical August baselines near 29°C underscore how this suppressed pattern tilts probabilities toward the lower end of the range while leaving room for minor upward revisions if models shift.