Official observations from the National Weather Service at Seattle-Tacoma International Airport recorded a maximum temperature of 67°F on October 14, 2026, under mostly clear skies with light southerly winds and minimal cloud cover that permitted strong daytime heating. This reading aligns precisely with the market's 66-67°F resolution band, reflecting verified instrumental data rather than models or forecasts. Trader consensus at 100% probability rests on the final post-event climate summary, which incorporates peak values from calibrated stations during the afternoon hours. Realistic challenges remain limited but could include rare post-hoc data revisions for instrument calibration or discrepancies if auxiliary stations reported slightly lower peaks due to microclimate effects, though such adjustments are uncommon for this well-monitored site.