Over the past 10 years, Istanbul Marathon runners have faced temperatures ranging from 10\u00b0C (50\u00b0F) on cooler years to 20\u00b0C (68\u00b0F) in warmer editions. The median temperature of 13\u00b0C (56\u00b0F) puts this race in the neutral category for running conditions.
Wind speeds average 13 km/h during race hours, with peak gusts reaching 23 km/h in challenging years. Humidity sits around 75%, and there is a 30% chance of rain on race day.
These conditions translate to an estimated pace impact of +3.2% compared to ideal running conditions. For a 4-hour marathoner, that means roughly 8 minutes slower than a perfect-weather day.