Recent rainfall forecasts and early-month dryness are driving Seoul's October precipitation market, with the 85mm+ bin leading at 37% implied probability. Korea Meteorological Administration guidance indicates 10-50mm from a frontal system crossing October 12-13, following near-zero totals early in the month and a record 30.1°C high on the 12th. Historical October averages range 55-71mm, but model consensus shows additional showers possible mid-to-late month from lingering trough influences and typical autumn frontal passages. Traders appear to weigh the potential for cumulative totals to exceed the mean against the risk of drier steering patterns after the current event, consistent with observed variability in East Asian fall precipitation.