**Forecast models for September 26, 2026, in Mexico City point to a high near 25–26°C as the most probable outcome, consistent with the market’s leading probabilities of 46% for 26°C and 33% for 25°C.** Mexico City’s high elevation of roughly 2,240 meters keeps seasonal September highs typically in the 23–25°C range, and current guidance shows mostly cloudy skies, light winds, and scattered showers or drizzle that limit afternoon solar heating and cap peaks. Multiple model runs, including GEM and local forecasts, indicate maxima around 24–25°C with brief periods near 25–26°C possible if cloud breaks allow more insolation, while rain chances of 30–50% act as a cooling influence. These conditions align with the modest 15.5% odds for 27°C or higher and very low probabilities for cooler readings, reflecting trader assessment of stable late-summer patterns without unusual heat or clear-sky amplification. Updated model outputs and official service briefings tomorrow morning will provide the final data for market resolution.