**The official maximum temperature observation for Mexico City on October 12, 2026, reached 25°C, driving the market's near-certain consensus on that outcome.** Multiple forecast models from agencies including the Met Office and local meteorological services converged on a daytime high of 25°C amid persistent cloud cover, high humidity, and widespread showers that limited solar heating and kept surface temperatures in check. This aligns with mid-October climatology for the high-elevation Valley of Mexico, where typical highs range from 22–26°C under similar rainy-season conditions. Post-event station data, including reports near 79°F (approximately 26°C) at some sites but resolving to 25°C at the primary reference, confirmed the threshold without upward revision. Only substantial discrepancies in official CONAGUA or equivalent records—such as station-specific anomalies or data corrections—could realistically alter resolution.