**Official observations from the National Weather Service at Seattle-Tacoma International Airport recorded a daily maximum of 66–67°F on October 3, 2026, under clear skies with light northerly winds after morning fog cleared.** This aligned precisely with pre-event forecast consensus from NOAA models projecting a high near 66°F, consistent with the climatological average high of 64.7°F for the date and typical early-October conditions featuring mild Pacific air and minimal cloud cover. Trader consensus at 100% implied probability for the 66–67°F bin reflects the high-confidence match to verified station data rather than any forecast uncertainty. Realistic challenges would require a post-analysis revision to the official reading (e.g., due to station calibration or quality control) or a shift in the market’s defined measurement criteria, though such adjustments are uncommon once preliminary climatological summaries are issued.