Trader consensus on a 25°C high for Mexico City on September 11 reflects pre-event forecasts from official sources projecting a maximum of 25°C amid 75% rain probability, persistent cloud cover, and typical September climatology with average highs near that mark. Hourly observations and model runs showed peaks clustered at 23–25°C, limited by atmospheric moisture and lack of strong solar heating. This skin-in-the-game positioning aligns with verified station data from the Benito Juárez International Airport region and historical baselines. A realistic challenge would require revised official measurements or localized microclimate readings exceeding 25°C, though current evidence indicates minimal likelihood of such an outcome.