www.shonan-kokusai.jp

Shonan International Marathon

location_on

Oiso, Kanagawa, Japan

calendar_today 07 Dec, 2025

About the Event

Experience the ultimate fusion of coastal beauty and international spirit at the Shonan International Marathon. This premier event draws runners from across the globe to a breathtaking course that showcases the iconic Shonan coastline, with its sweeping ocean vistas and fresh sea breezes. As a key destination marathon, it offers a perfectly balanced challenge for both elite athletes and recreational runners seeking a world-class experience. The vibrant, festival-like atmosphere is fueled by strong community support and a lineup of exclusive events, including official training sessions and special marine activities. Prepare for an unforgettable race where the stunning Pacific Ocean backdrop and the energetic international vibe create the perfect setting for a personal best or a truly memorable running achievement.

Races Offered

Marathon

Dec 07, 2025

straighten

Distance — 42.2K

terrain

Type — —

timer

09:00

Weather Overview

These values represent the 3-year monthly averages for December in Oiso.

Temp (°C)

Feels Like (°C)

thermostat 3.7° / 12.4°

wb_sunny 0.1° / 9.1°

Wind (km/h)

Humidity (%)

air 8.9 /

water_drop 63.5%

Temp (°C)

Feels Like (°C)

Wind (km/h)

Humidity (%)

thermostat 3.7° / 12.4°

wb_sunny 0.1° / 9.1°

air 8.9 km/h

water_drop 63.5%

About Oiso

Learn more about the host city, Oiso.

Ōiso is a town located in Kanagawa Prefecture, Japan. As of 1 January 2023, the town had an estimated population of 31,262 and a population density of 1820 persons per km². The total area of the town is 17.18 square kilometres (6.63 sq mi).