Traders see the highest temperature in Mexico City on July 17 as most likely 23–24°C because current model consensus from regional and global ensembles shows afternoon peaks in that narrow range under typical July highland conditions. Mexico City’s 2,240-meter elevation and urban heat island moderate extremes, while variable cloud cover, scattered showers, and steering winds create the main uncertainty separating 23°C from 24°C outcomes. Recent model runs have tightened around these values with limited spread, keeping 25°C as a plausible upside scenario and sub-22°C probabilities low given seasonal baselines. New observational data and updated forecasts tomorrow morning will likely refine the final distribution before market resolution.