As of September 25, Seattle-Tacoma International Airport has recorded roughly 1.2 inches of precipitation month-to-date against a normal near 1.2 inches, positioning the final September total near the lower end of typical variability. A late-month frontal system delivered 0.2–0.5 inches on September 24–25, with additional showers possible through early October according to National Weather Service guidance. This recent accumulation has tightened market-implied odds between the 1.5–2 inch and 2–2.5 inch bins, reflecting modest uncertainty in remaining rainfall amounts and steering patterns that could either suppress or enhance totals. Historical September averages hover around 1.5–2 inches, underscoring how sensitive the outcome remains to the next few days of model consensus.