Over the past 10 years, Honolulu Marathon runners have faced temperatures ranging from 22\u00b0C (71\u00b0F) on cooler years to 26\u00b0C (80\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 20 km/h during race hours, with peak gusts reaching 27 km/h in challenging years. Humidity sits around 69%, and there is a 50% chance of rain on race day.
These conditions translate to an estimated pace impact of +10.3% compared to ideal running conditions. For a 4-hour marathoner, that means roughly 25 minutes slower than a perfect-weather day.