Official National Weather Service observations recorded a maximum temperature of 74°F at San Francisco Airport on October 13, 2026, aligning precisely with the market's dominant 74-75°F outcome. This reading occurred under clear skies with light northerly winds transitioning to westerly, producing conditions slightly above the 1991-2020 normal high of 73°F. Hourly METAR data confirm peak values reached 74°F mid-afternoon before cooling, consistent with regional high-pressure dominance and minimal marine layer influence. Trader consensus reflects this verified measurement, as post-event resolution leaves little room for revision. Alternative bins remain improbable absent any documented station discrepancies or microclimate variations exceeding measurement thresholds.