**Traders see sub-150 mm totals as most probable for Seoul’s August 2026 precipitation because the East Asian monsoon front retreated earlier than normal and late-summer systems have largely bypassed the capital.** Historical normals place August rainfall near 260–348 mm, driven by lingering monsoon moisture and occasional typhoon tracks, yet 2026 observations show lighter accumulations through late August. Recent Korea Meteorological Administration guidance indicates only 5–60 mm expected in the Seoul metropolitan area from the final weekend’s stationary front, with heavier cells concentrated farther south. Weak steering patterns and a stronger North Pacific High have limited organized convective bands and typhoon landfalls near the region, keeping cumulative amounts well below climatology. With only one or two days left in the month, additional significant rainfall is unlikely to push totals into the higher bins, aligning market-implied odds with the observed dry bias.