Do this now

Follow these steps in order.

  1. 01

    Mark every long-distance trip between August 7 and 16 and identify the exact train and operator.

  2. 02

    Reserve a Nozomi seat now if it is your preferred Tokaido or Sanyo Shinkansen service.

  3. 03

    Reconfirm accommodation, attractions, restaurants and luggage services individually around August 11–16.

  4. 04

    Check the official WBGT heat-stress forecast each morning and move outdoor activity away from the hottest part of the day.

  5. 05

    Before leaving for a station or airport, reopen the operator status page and current JMA warnings.

What to know

The dates to put in your 2026 itinerary

These dates affect different parts of the trip. Treat them as planning triggers, not as a claim that every place in Japan follows one holiday schedule.

  • August 7–16: all seats on Nozomi trains on the Tokaido and Sanyo Shinkansen are reserved.
  • August 11: Mountain Day is a Japanese national holiday.
  • August 13–16: JNTO describes this as the typical Obon period, when domestic flights, trains and highway buses can sell out in advance.

What to know

What “all Nozomi seats are reserved” means

During the August 7–16 peak period, Nozomi trains do not offer a non-reserved seating section. To sit on a Nozomi, buy a reserved-seat limited-express ticket in advance.

JR Central states that a traveler holding only a non-reserved limited-express ticket may be directed to stand on the deck of an ordinary car, and may be unable to board the preferred train when it is overcrowded. Hikari and Kodama retain non-reserved seating, but those cars may also be crowded.

A nationwide JAPAN RAIL PASS does not include Nozomi or Mizuho travel by itself. A separate Nozomi/Mizuho ticket is required; check the official pass and operator instructions before purchase.

What to know

Reserve the train before locking the day plan

SmartEX is the official online reservation service for the Tokaido, Sanyo and Kyushu Shinkansen. JR Central states that standard reserved seats go on sale at 10:00 a.m. Japan time one month before departure, while a limited selection of products can be requested earlier through the online service.

Information checked on July 24, 2026: seats for the August 7–16 period are already within the normal sales window. Confirm the train, passenger names, date, route and ticket pickup or QR boarding method before paying.

What to know

Obon is not one nationwide closure rule

Obon is a major family and travel period, but it is not listed as a national holiday on the Cabinet Office calendar. Individual restaurants, clinics, attractions and small businesses may use different closing dates.

Check the official page or contact each place that matters to your itinerary. Do not infer an opening schedule from another branch, an old map listing or a general Obon article.

What to know

Use the heat-stress index, not temperature alone

The Ministry of the Environment and Japan Meteorological Agency issue a Heat Stroke Alert when the forecast heat-stress index, or WBGT, is expected to reach 33 or higher in any monitoring point within the relevant region. The English official site shows current and forecast WBGT values.

Check the destination rather than only the departure city. Build in air-conditioned breaks, carry water, reduce long outdoor transfers with luggage and change the schedule when official guidance indicates dangerous conditions.

What to know

Keep weather disruption decisions flexible

Summer weather can disrupt rail, air and ferry plans. JMA issues warnings and advisories, while each operator controls its own service decisions. Recheck both before departure and avoid relying on a screenshot captured earlier in the day.

If a warning or suspension affects the route, follow local authorities and the operator’s current instructions. Protect the next accommodation booking first, then rebuild the itinerary around confirmed services.

If that does not work

Use the fallback.

  • If the preferred Nozomi is full, compare another departure time or date and check reserved Hikari or Kodama options.
  • If a business has not published its Obon schedule, choose a confirmed alternative rather than assuming it will open.
  • If the WBGT or local warning makes the plan unsafe, move outdoor activity to another day or replace it with an indoor route.
  • If transport is suspended, use the responsible operator’s refund or change instructions before buying a duplicate ticket.

Before you need it

Save this offline.

  • Train reservation and boarding method
  • Seat, car and luggage reservation details
  • Accommodation contact and late-arrival policy
  • JR operator status pages
  • JMA warning page
  • Ministry of the Environment WBGT page
  • Travel insurer and JNTO visitor hotline details

Primary evidence

Official sources used

Open these pages again before travel. External links lead to the responsible Japanese authority or transport organization.

JR Central / JR West — Nozomi peak-period seatingOfficial 2026 dates and boarding rules for all-reserved Nozomi service during peak periods.
SmartEX — Official Shinkansen online reservationOfficial booking route for the Tokaido, Sanyo and Kyushu Shinkansen.
JNTO — Japan in AugustOfficial visitor guidance on August travel, Obon and advance transport reservations.
Cabinet Office — 2026 national holidaysOfficial calendar confirming Mountain Day on August 11, 2026.
Ministry of the Environment — Heat illness preventionOfficial English heat-stress index, forecasts and Heat Stroke Alert information.
Japan Meteorological Agency — Weather warningsOfficial explanation and access point for weather warnings, advisories and emergency warnings.