Official observations from the automated surface observing system at San Francisco International Airport (KSFO), as reported by Weather Underground, confirm the highest temperature on May 9 reached 63°F amid persistent marine layer stratus clouds and moderate west winds typical of the region's coastal climate. This aligns with trader consensus at near-certainty for the 62-63°F bin, reflecting verified hourly data showing peaks around midday before cooling under overcast skies and below-average insolation. Seasonal norms for May hover around 67-68°F, but cool Pacific air masses and high pressure aloft steered low-level onshore flow, capping daytime heating. Scenarios challenging this include rare post hoc data revisions from quality control audits by NOAA, though such adjustments are infrequent for established readings. Traders await no further updates as the market nears resolution.