Over the past 10 years, Great North Run 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 15\u00b0C (59\u00b0F) puts this race in the neutral category for running conditions.
Wind speeds average 15 km/h during race hours, with peak gusts reaching 25 km/h in challenging years. Humidity sits around 71%, and there is a 20% chance of rain on race day.
These conditions translate to an estimated pace impact of +4.0% compared to ideal running conditions. For a 4-hour marathoner, that means roughly 10 minutes slower than a perfect-weather day.