Japan Typhoon Travel 2026: Alerts, Rebooking and Data After Dujuan

Japan typhoon travel in 2026 means planning around September, the peak. On 21 September, Typhoon Dujuan forced the cancellation of at least 275 flights and stopped some rail lines around Tokyo. Install the Japan Tourism Agency's Safety tips app, bookmark the Japan Meteorological Agency's warning map and carry mobile data that works away from hotel wifi. If your trip falls outside July to October, most of this will not apply.

What Typhoon Dujuan did to travel in Japan this week

Dujuan was the 25th typhoon of 2026. It brought wind, rain and landslides to the Tokyo region on 21 and 22 September. News reports put its winds at 144 km/h, and the national weather agency warned that rainfall through Tuesday could top the September monthly average.

For a visitor, the rows that matter are the first two. A cancelled flight or a stopped bullet train means rebooking from your phone, often while standing in a crowded station.

When is typhoon season in Japan?

Japan's typhoon season runs from roughly July to October, peaking in August and September. The Japan National Tourism Organization (JNTO) says storms can form at any time of year but most form between July and October. The Japan Meteorological Agency (JMA) publishes 30-year averages that put numbers on it:

September has the highest landfall average of any month, and it is also the peak month for the area around the capital. Okinawa sees more storms across the year: JMA averages 7.7 approaches a year there, peaking at 2.2 in August.

What to do if a typhoon hits during your trip

You should follow the official warnings and use the government's own tools. Every step below comes from an official Japanese source.

• Install Safety tips. The government's Safety tips app pushes earthquake early warnings, tsunami warnings and other weather warnings in 15 languages. It also carries an evacuation flowchart and phrases for asking people around you for information.
• Read the warning map. The warning map shows what is in force where you are staying.
• Know the alert levels. JMA uses five levels. At Level 3, older people and others who need more time should start evacuating. At Level 4, all residents should evacuate. A Level 5 emergency warning means "take all steps possible to protect yourself".
• Stay in and stock up. JNTO advises staying indoors, following TV or internet updates, buying food and water without panic-buying, and asking your accommodation staff about their emergency procedures.
• Save the hotline. The Japan Visitor Hotline, run by JNTO, answers around the clock in four languages, English included. The number is 050-3816-2787. The police number is 110.

The warning map and the online updates JNTO points you to both need a data connection. So does downloading the app if you skipped it before the storm.

Do trains and flights stop in a typhoon?

Yes, some do. During Dujuan, operators suspended some lines around the capital and part of the bullet train service to Osaka, and Japan's two big airlines cancelled 275 flights between them in one day. JNTO tells you to leave ample time to reach your destination before services are temporarily suspended. It adds that typhoons usually pass in under 24 hours, while transport disruption can last longer.

For flights, All Nippon Airways (ANA) publishes the clearest rules:

The first row is the one to use. You can move a domestic ANA flight as soon as disruption is expected, without waiting for the cancellation. Japan Airlines (JAL) publishes its own rules, but its pages block automated readers, so check them on the airline's site.

Best eSIM for Japan in typhoon season, and how much data

Our single-country plan for Japan starts at $4.95 for 5GB, and 10GB for 10 days costs $6.95. Each runs on one of three networks: NTT DoCoMo, KDDI or SoftBank. The plan card names which. Prices come from our live catalogue on 25 September 2026, and they match what you pay through the button at the end of this post.

The carrier differs at the same size. For 10GB over 10 days, DoCoMo costs $6.95. KDDI costs $7.95 and SoftBank $8.95. Our carrier breakdown explains what separates the three networks on quality, speed and land coverage. One handset point from that post matters here: DoCoMo relies on bands some overseas phones lack, so check whether your device supports eSIM and those bands before you buy.

If you are visiting several countries, the Asia-Pacific regional plan covers Japan and 11 other destinations, at $5.95 for 5GB of any duration. Its Japan leg runs on Rakuten Mobile, a network none of the country plans use.

Our take: in August to October, buy one tier above your normal habit. A storm day is when you are indoors refreshing rail status, rebooking a flight and reading warnings, and the step from 5GB to 10GB costs $2.

Flying on elsewhere in the region? Our guides to Seoul in October and the Sepang race weekend cover the next leg.

Does my eSIM work if networks go down?

Your eSIM works while the mast near you has power. The mast also needs a working link back to the network. When they fail, every phone on that mast loses service, whatever card or eSIM it uses. The communications ministry looked at this after the Noto Peninsula earthquake. Its 2024 white paper says power cuts and severed transmission lines left mobile base stations out of service for long periods. The fixes it lists are longer-life batteries, solar panels and satellite links.

Dujuan cut power to tens of thousands of homes, so it is worth knowing the fallback.

The fallback when masts fail is 00000JAPAN, pronounced "five zero Japan". The ministry describes it as public wifi that operators open free to everyone during a disaster, first used in the 2016 Kumamoto earthquakes. You do not need to sign up. The network is unencrypted, so the ministry and SoftBank both warn against sending sensitive information over it. SoftBank lists stations, airports, malls, cafés and convenience stores as places it appears.

Activations are local, one area at a time. The WiBiz activation log shows two August 2026 cases: evacuation shelters during heavy rain in the city of Uozu, and a landslide warning in the city of Oshu. If your home carrier supports wifi calling, you can take calls to your usual number over it. Our guide to wifi calling and roaming charges explains how.

What this guide does not cover

We did not test any network during Dujuan. Nothing here tells you which carrier held up best in the storm. We quote no figure for how long a Japanese base station runs on battery, because we found no ministry figure for it. JAL's and JR East's rebooking and refund pages block automated access, so their rules are left for you to read directly. Casualty and outage counts changed through the week, and later reports may differ from the 22 September figures above.