**Trader sentiment strongly favors a 14°C low for Mexico City on September 11, 2026, with an 86.5% implied probability, reflecting consensus from official observations and forecasts.** Mexico City’s high elevation (~2,240 m) produces relatively cool nights even in September’s rainy season, when average lows typically range 12–13°C amid frequent cloud cover and showers that limit radiative cooling. On this date, model consensus and station data pointed to a minimum near 14°C, with hourly readings bottoming around that level amid light rain and high humidity rather than clearer, colder conditions that could have pushed readings to 13°C or below. The elevated 48.5% probability on 13°C captures residual uncertainty in microsite variations or measurement timing, but the dominant 14°C outcome aligns with National Meteorological Service guidance and real-time monitoring. Upcoming resolution will hinge on final verified station data from sources like the Benito Juárez International Airport network, confirming the exact daily minimum against these climatological baselines.