Official forecasts from the National Weather Service and supporting model runs projected a peak temperature of 66–67°F for Seattle on October 1, 2026, under stable high pressure with light northerly winds and minimal cloud cover limiting daytime heating. Observed conditions at Sea-Tac Airport aligned closely with this guidance, producing a maximum of 68°F that fell just outside the dominant bin yet reinforced trader consensus around the mid-60s given climatological norms near 65°F and limited variability in steering patterns. Scenarios that could have challenged this outcome, such as stronger onshore flow or unexpected clear-sky amplification, remained low-probability based on ensemble consensus and real-time observations.