Recent forecast guidance from meteorological agencies points to daytime highs of 27–28°C in Mexico City on May 18, reflecting typical late-spring conditions at the city’s 2,240-meter elevation where solar heating intensifies under mostly clear skies. This aligns with observed highs of 26–29°C over the preceding two days and May climatological averages near 26–27°C, with minimal influence from passing moisture or cloud cover expected to suppress temperatures. Model consensus favors continued warm advection from the south, though minor revisions could occur with updated runs ahead of the date; traders’ strong preference for 27°C or higher captures this baseline trajectory while leaving limited room for cooler deviations from atypical wind shifts or increased afternoon convection.