Official National Weather Service observations recorded a daily high of 66–67°F in Seattle on October 6, 2026, establishing the market-implied outcome at near-certainty. A persistent high-pressure ridge promoted subsidence and offshore flow, suppressing cloud cover and allowing greater solar heating than typical for early October, when the 1991–2020 climatological average high is 63.7°F. Light winds and low humidity further amplified daytime warming without significant marine-layer intrusion. This outcome aligns with recent model consensus and surface analyses showing temperatures peaking in the mid-60s under clear skies. Only an unlikely post-event data revision from the primary reporting station could alter resolution.