Official observations from the National Weather Service at Seattle-Tacoma International Airport recorded a daily maximum of 74°F on September 6 under mostly clear skies and light northerly winds, aligning closely with the long-term normal of 74°F and seasonal late-summer patterns. Trader consensus at 100% on the 72-73°F bin reflects aggregated real-money assessment of these measurements, model outputs, and historical analogs for early September, where highs typically cluster near 73°F. This positioning could shift only if revised station data, alternate official sources, or quality-control adjustments alter the final reported high into an adjacent bin, though such revisions are uncommon once preliminary climatological summaries are issued.