Official meteorological observations from the National Weather Service and Sea-Tac Airport data confirm a daily high temperature of 68–69°F in Seattle on October 4, 2026, under clear skies following morning fog dissipation and light northerly flow. This aligns with regional model consensus and surface analyses showing modest daytime warming without significant onshore advection or cloud cover to suppress maxima. Trader consensus at near-100% implied probability reflects this verified outcome from authoritative station records. Measurement variations across micro-sites or slight revisions in final climatological summaries remain the only realistic factors that could shift resolution, though historical precedent indicates such adjustments rarely exceed 1–2°F for this location and date.