Yokohama Marathon

This edition is listed as Marathon in Yokohama, Kanagawa, Japan.

Typical race-morning air at Yokohama Marathon averages 16°C across the last 10 years (about 11°C to 21°C in that window). The morning can still warm as you run. The stickiest morning in that set was 2023, WBGT around 19°C. 2019 was the windiest, around 37 km/h. Use that range for planning, not as a promise for race day.

2023 (29 Oct 2023) was the hottest Yokohama Marathon morning in that set, WBGT around 19°C. Treat that year as the spike, not as the usual morning.

2019 (10 Nov 2019) was the windiest Yokohama Marathon morning in that set, around 37 km/h. Wind still changes what the same pace costs. Treat that year as the spike, not as the usual morning.

Inside about 14 days, use the live forecast on this page. The current outlook is about 19°C to 21°C, around 4 km/h wind and 80% humidity. Forecasts move. Further out, use race morning history, not a locked plan.

Heat, humidity, wind or a lumpier day than you hoped all raise the chance of a late fade. If the start feels easy, don't spend it. Back off early, and hold even effort even if that means slower than the A-goal. The preview on this page is the starting point. Full personalised splits sit in Race Pass or Pro.

About 121 m of climbing and 125 m of descent. Rolling. Almost all of it sits within 2%. No steep grades over 6%. Three climbs.

It is an estimate of how the course and conditions could move your baseline. Your body still decides the rest: heat adaptation, fuelling, prep, mindset, how you race, and whether you can draft.

The free page covers conditions, course context and a finish preview. Full personalised pacing and weather-adjusted splits sit in Race Pass or Pro.