Overview

• Start times for the 35km race walk and both marathons were moved 30 minutes earlier to 7:30 a.m., keeping the road events in Tokyo unlike the 2021 Olympic relocation to Sapporo.
• Forecasts indicate daytime highs of 31–34C with heavy humidity over the opening weekend, and Tokyo has averaged 33C so far this month.
• Japan recorded its hottest June–August since 1898, with average temperatures 2.36C above normal, the Japan Meteorological Agency reported.
• Heat safeguards include 185 marathon water stations, radiative‑cooling tents, wearable core‑temperature monitors for staff and volunteers, and roaming first responders.
• Sebastian Coe said sport may need unilateral scheduling choices in response to climate risks, as World Athletics reports over 95% completion of mandatory SRY testing for the female category.