Over the past 10 years, Spartathlon runners have faced temperatures ranging from 19\u00b0C (66\u00b0F) on cooler years to 28\u00b0C (83\u00b0F) in warmer editions. The median temperature of 24\u00b0C (75\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 50%, and there is a 10% chance of rain on race day.
These conditions translate to an estimated pace impact of +7.7% compared to ideal running conditions. For a 4-hour marathoner, that means roughly 18 minutes slower than a perfect-weather day.