Tokyo Marathon: What Weather Can You Expect on Race Day?

The Tokyo Marathon opens the Abbott World Marathon Majors season

In 2026, as it has for several years now, the Tokyo Marathon will open the season of the world’s biggest marathons. On March 1, 2026, tens of thousands of runners will take on the iconic 42.195 km that make up a marathon. The Tokyo Marathon course blends local landmarks, including the Imperial Palace, Tokyo Tower, Asakusa and Ginza, with a lively atmosphere created by the crowds lining the roads. Known for its fast route, it attracts plenty of record chasers looking to improve their personal bests.

The Japanese race’s appeal does not end there. Thanks to meticulous organisation, running the Tokyo Marathon becomes a genuine sporting and cultural experience. The race usually starts at around 9 a.m. local time, in front of the Tokyo Metropolitan Government Building. The 40,000 runners have a maximum of seven hours to complete the 42.195 km ahead of them. While temperatures are generally ideal for marathon running, the local climate is still worth understanding before you arrive.

What weather can you expect in Tokyo in early March?

East Asian countries are known for high temperatures and a relatively humid, oppressive climate during the summer. Spring, however, is much more comfortable in this part of the world. In early March, temperatures remain fairly cool but are still close to ideal for a marathon. At the start, it is generally between 4 and 7°C. Depending on the amount of sunshine, highs can reach around 13°C during the race.

These temperatures are considered favourable for long-distance running because they help prevent the body from overheating too quickly. Temperatures also rise gradually throughout the race without reaching excessive highs. Wind is rarely an issue, which is particularly welcome if you are chasing a time. In March, humidity in Tokyo is also significantly lower than in summer. It ranges from 60 to 70%, compared with more than 75% during the most humid months. Moderate humidity reduces the heavy feel of the air, making endurance efforts more comfortable. A few rainy days can occur in March, although there is no guarantee that rain will make an appearance on Tokyo Marathon day.

Why are these conditions favourable for runners?

• Ideal temperatures for endurance running

• Little risk of excessive heat

• A good compromise for recreational runners and those chasing fast times

What should you wear for the Tokyo Marathon?

The number one rule for any race is to arrive in Tokyo with equipment you have already tested in training. Never try out new kit on race day: it is an easy way to invite unwanted surprises. For the Tokyo Marathon, the challenge is straightforward: stay warm before the start without overheating after a few kilometres.

As mentioned above, temperatures are cool at the start. And, as with all major international races, runners enter their starting corrals relatively early. That means waiting around for several minutes before you can run. An extra layer for this pre-race wait is therefore a smart move. You can hand your jacket to a friend or family member shortly before the gun goes, or leave it in your starting corral. These clothes are often collected afterwards and donated to charities.

With temperatures generally between 5 and 10°C at the start, you have two options depending on how sensitive you are to the cold. Short sleeves may be enough if you tend to overheat quickly. Long sleeves or arm warmers are a better choice if the sky is overcast or you feel the cold more readily. You can also add a pair of lightweight gloves, ideal for the opening kilometres and easy to stow away later. A cap can be useful too, either for protection from possible rain or from the sun. In short, go for a simple, breathable outfit that has been thoroughly tested during your marathon training.

Acclimating and adapting to Japanese weather

Although the weather at the Tokyo Marathon is often favourable for fast performances, it differs from the conditions many Europeans experience during winter. The challenge is not just managing the temperature, but also giving your body time to adapt to a new environment after a long journey and a change of time zone. Arriving four or five days before the race gives you time to experience the new climate and complete one final test run on site. Plan the contents of your suitcase carefully so that you have several clothing options once you arrive.

It is also essential to adjust your hydration, especially after a long flight. To limit dehydration, drink small amounts regularly from the moment you arrive in Tokyo. Keep eating healthy, easily digestible food right up to race day. These simple habits will make acclimation easier. Heavy legs, less fluid breathing or disrupted sleep are also normal reactions after a long journey. There is no need to try to fix them at all costs. Your body will gradually adapt in the days leading up to the Tokyo Marathon.

The Tokyo Marathon is often run in ideal conditions, but it still requires a methodical approach. Preparing for the weather, adapting to the local climate and paying attention to your body’s signals are the keys to making the most of this exceptional race. Well prepared, you can turn Japanese weather into a genuine ally on the way to the finish line, and perhaps come home with a new personal best.

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