Official National Weather Service observations from Seattle-Tacoma International Airport recorded a daily maximum of 67°F on October 7, 2026, aligning with the market's near-certain 66-67°F outcome. This value sits modestly above the 1991-2020 climatological average high of 63°F for the date, consistent with clear to partly cloudy conditions and light northerly winds that limited overnight cooling while allowing modest daytime warming under autumnal solar angles. Recent model guidance and preliminary climate summaries had converged on this range days earlier, with minimal forecast spread. Resolution hinges on the official station reading, so alternate station data or unreported microclimate variations remain the only realistic pathways for deviation, though such shifts are rare for this benchmark site.