The market's 100% consensus on a 62-63°F high for Seattle on September 24, 2026, reflects the official National Weather Service observation of a 63°F maximum at Seattle-Tacoma International Airport, recorded at 12:22 p.m. under overcast skies and light northerly winds. This outcome fell six degrees below the 1991-2020 normal of 69°F, driven by a strengthening low-pressure system that delivered cooler maritime air and suppressed afternoon warming typical for late September. Recent model runs and surface observations showed minimal diurnal temperature rise amid persistent cloud cover, aligning with historical analogs for similar synoptic setups. While measurement revisions or station-specific microclimates could theoretically alter resolution, the verified airport reading leaves little room for deviation from the dominant outcome.