Official measurements from the Hong Kong Observatory confirm that the maximum temperature on September 3 reached 30°C at multiple stations, including peaks near 30.1°C in afternoon readings, while remaining below 31°C amid typical late-summer conditions with cloud cover and light winds. This aligns with climatological averages for early September and recent model consensus showing limited daytime heating under unsettled weather patterns. The market's near-certain pricing on 30°C reflects this verified observational record. A realistic challenge would require an official data revision or a different resolution station reporting a higher value.