Over the past 10 years, Mexico City Marathon runners have faced temperatures ranging from 14\u00b0C (56\u00b0F) on cooler years to 23\u00b0C (73\u00b0F) in warmer editions. The median temperature of 19\u00b0C (66\u00b0F) puts this race in the neutral category for running conditions.
Wind speeds average 6 km/h during race hours, with peak gusts reaching 11 km/h in challenging years. Humidity sits around 70%, and there is a 80% chance of rain on race day.
These conditions translate to an estimated pace impact of +4.4% compared to ideal running conditions. For a 4-hour marathoner, that means roughly 11 minutes slower than a perfect-weather day.