Official measurements from the National Weather Service for September 14, 2026, recorded a daily maximum of 74–75°F at the primary San Francisco reporting station, aligning with seasonal norms around 70–75°F and consistent with coastal marine layer influences that moderated afternoon highs. This observational data, verified through standard instrumentation and quality controls, underpins the near-certain market-implied odds for the 74–75°F bin. Minor model or station discrepancies could theoretically prompt a revision, though historical patterns show such adjustments rarely exceed 1–2°F for this location and date.