**Trader consensus for a daily maximum of 25°C or higher in Mexico City on September 8 rests on confirmed observational data showing a high of 25°C.** Official station records, including those referenced in meteorological summaries, captured this peak amid typical early-September conditions in the city's highland subtropical climate, where afternoon temperatures commonly climb into the low-to-mid 20s during the rainy season. Forecasts from multiple models had projected highs near 23°C with scattered showers, yet actual measurements aligned with or slightly exceeded those expectations due to localized solar heating before cloud cover increased. With the date now past, resolution hinges on verified maximums rather than models, leaving negligible probability for lower brackets. Only an unreported data revision from primary sources could alter the outcome.