Official meteorological observations from Servicio Meteorológico Nacional stations in Mexico City recorded a daily maximum of exactly 26°C on June 11, 2026, driving the market's near-certain consensus on that outcome. This aligns with surface station data and aligns with regional atmospheric conditions, including moderate humidity, limited daytime heating under partly cloudy skies, and typical early-summer patterns at the city's high elevation. Forecast models from prior days had converged on a narrow 24–26°C range, reducing uncertainty as the date approached. While minor station-to-station variations or post-processing revisions could theoretically alter the recorded high, the consistency across official networks makes such shifts improbable for market resolution.