Over the past 10 years, Comrades Marathon runners have faced temperatures ranging from 14\u00b0C (57\u00b0F) on cooler years to 23\u00b0C (74\u00b0F) in warmer editions. The median temperature of 20\u00b0C (68\u00b0F) puts this race in the challenging category for running conditions.
Wind speeds average 10 km/h during race hours, with peak gusts reaching 17 km/h in challenging years. Humidity sits around 59%, and there is a 10% chance of rain on race day.
These conditions translate to an estimated pace impact of +5.2% compared to ideal running conditions. For a 4-hour marathoner, that means roughly 12 minutes slower than a perfect-weather day.