Official National Weather Service observations at Seattle-Tacoma International Airport recorded a daily maximum of 63°F on September 29, 2026, reached at 2:27 PM local time, with a minimum of 55°F under mostly cloudy skies and light precipitation. This places the high squarely in the 62-63°F range, consistent with late-September marine-layer influences that often cap temperatures near or below the 1991-2020 average high of 66°F. Trader consensus at near-certainty reflects these verified surface measurements rather than model forecasts. The outcome could shift only in the improbable case of post-hoc data revisions or use of a non-standard station, both highly unlikely given NWS protocols and historical consistency.