Official meteorological observations from Sao Paulo's primary stations confirmed a daily maximum of 25°C on August 21, underpinning the market's unanimous 100% consensus on this outcome. In the Southern Hemisphere winter, subtropical high-pressure systems and light winds typically cap daytime heating near seasonal averages of 23–26°C, with no recent frontal passages or enhanced solar radiation to push temperatures higher. Regional forecast models aligned closely with these readings throughout the period, reducing uncertainty in the final recorded value. While minor post-event data revisions remain theoretically possible, established urban monitoring networks rarely alter maxima enough to shift resolution thresholds.