Over the past 10 years, Buenos Aires Marathon runners have faced temperatures ranging from 14\u00b0C (58\u00b0F) on cooler years to 24\u00b0C (75\u00b0F) in warmer editions. The median temperature of 19\u00b0C (66\u00b0F) puts this race in the challenging category for running conditions.
Wind speeds average 21 km/h during race hours, with peak gusts reaching 32 km/h in challenging years. Humidity sits around 69%, and there is a 10% chance of rain on race day.
These conditions translate to an estimated pace impact of +6.1% compared to ideal running conditions. For a 4-hour marathoner, that means roughly 15 minutes slower than a perfect-weather day.