Itabashi City Marathon
Race Day Weather
Cool start — fast day potential, moderate wind, chance of rain
A cool 50°F at the start line is ideal for fast times — expect to warm up quickly once you're moving. Moderate winds around 14mph may affect pacing on open sections of the course. There's a chance of rain, so have a backup gear plan ready.
Pace Calculator
Enter a finish time to see what race day does to it.
Get forecast alerts for Itabashi City Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Race Info
The Itabashi City Marathon runs along the Arakawa riverbed in northern Tokyo, an out-and-back course starting and finishing upstream of Toda Bridge in Itabashi Ward with a turnaround near Arakawa Ohashi Bridge. The course is certified by the Japan Athletics Federation and authenticated by World Athletics as record-eligible, with a flat, minimal-elevation layout along the river levee. The marathon caps entries at 10,000 runners and sets a 7-hour course time limit. The 2027 race is the event's 30th edition.
