Official National Weather Service observations from Seattle-Tacoma International Airport recorded a maximum of 70°F on September 7, 2026, under persistent marine influence and northerly flow that suppressed daytime heating below the 72.6°F climatological average. This outcome aligned with multiple preliminary climatological reports confirming the high occurred near 4 PM local time, with no evidence of localized warming or instrument variance that would shift the reading into adjacent bins. Trader consensus at 100% for the 70-71°F range reflects the final verified data release, though minor resolution risk remains if a secondary station or quality-control adjustment yields a 71°F or 72°F value.