Official observations from the Hong Kong Observatory recorded a maximum air temperature of 31°C on September 16, 2026, driving the market's near-certain consensus at that level. This aligns with late-summer subtropical conditions, where high pressure and urban heat island effects typically produce daily highs near 30–32°C. Verified station data, rather than models, underpin the outcome, consistent with historical mid-September climatology for the region. Measurement thresholds and reporting protocols from the observatory leave minimal room for revision. Only an unprecedented post-publication correction or instrument anomaly could alter resolution, scenarios with negligible historical precedent.