Over the past 10 years, Bangkok Marathon runners have faced temperatures ranging from 25\u00b0C (76\u00b0F) on cooler years to 32\u00b0C (89\u00b0F) in warmer editions. The median temperature of 29\u00b0C (85\u00b0F) puts this race in the challenging category for running conditions.
Wind speeds average 7 km/h during race hours, with peak gusts reaching 11 km/h in challenging years. Humidity sits around 69%, and there is a 30% chance of rain on race day.
These conditions translate to an estimated pace impact of +13.4% compared to ideal running conditions. For a 4-hour marathoner, that means roughly 32 minutes slower than a perfect-weather day.