Official meteorological observations from stations in São Paulo confirmed a daily maximum temperature of 15°C on September 6, aligning precisely with the market's near-certain resolution at that level. This outcome reflects direct measurements rather than forecasts, consistent with early September climatology in the region where highs typically range 14–18°C under stable subtropical high-pressure influence. Model consensus from agencies like INMET showed minimal diurnal variation and no significant warm-air advection or urban heat-island amplification. While rare discrepancies in station siting or post-processing adjustments could theoretically alter the recorded peak, the overwhelming agreement across multiple verified sites leaves negligible room for alternative outcomes.