Official meteorological observations from São Paulo stations, including Congonhas Airport data, established a daily maximum of precisely 30°C on October 14, 2026, driving the market's near-certain consensus on that outcome. Springtime conditions featured scattered thunderstorms and cloud cover that moderated peak heating, aligning with model consensus from regional forecasts and preventing readings at higher thresholds. Historical October averages near 31°C provide context, yet localized rainfall and wind patterns kept values in line with verified measurements. While post-event data revisions remain theoretically possible, the convergence of multiple station reports and consistent observational records leaves little realistic scope for alteration.