Official observations from San Francisco International Airport station KSFO recorded a maximum temperature of 64–65°F on May 15, locking in the near-certain market consensus for that bin. Persistent marine-layer advection from the Pacific, combined with partial stratus burn-off under building high pressure, produced conditions that aligned closely with the May climatological average near 67°F while preventing stronger afternoon warming. National Weather Service guidance and real-time surface data showed no model runs or observational shifts capable of pushing readings into the 66°F+ range, leaving only minimal uncertainty around instrument calibration or reporting adjustments. Upcoming hourly verification reports from the same station will finalize resolution without altering the dominant positioning.