Seasons in Japan
Storm season runs August to October
Japan is in its storm season right now, August to October. Most trips are unaffected, but a storm reroutes flights and closes beaches at a day's notice — the packing consequence is a buffer day and a charged power bank, not different clothes.
Going in September
Hot and very humid, worst in late July and August. Tokyo regularly sits above 35°C with nights that barely cool.
What this means for your bag
Room for humidity
Everything stays slightly damp. Pack fewer clothes and plan to wash them, and keep anything that must stay dry in a sealed bag.
See the Summer Sun Kit packA bottle you will actually refill
Heat like this needs far more water than you think. A filter bottle also spares you buying a plastic bottle every two hours.
See the Health & Wellness packLoose, covering clothes
Long and loose beats short and tight in serious heat: it keeps the sun off skin and moves air. Linen and light cotton in pale colours.
See the Summer Sun Kit packA layer for indoor air conditioning
Malls, buses and restaurants are cooled far below the street, and the swing is what makes people ill. A light long sleeve doubles as sun cover and as dress code for temples and mosques.
See the Smart Casual Evening pack
Typhoon season, with September the most active month. A direct hit stops the trains and grounds flights for a day at a time.
What this means for your bag
A buffer day, and your documents on your phone
Storms reroute and cancel flights at short notice. Leave a day between the trip and anything unmissable, and keep bookings and insurance available offline.
See the Travel Documents Pack packA packable rain shell
Not a winter coat — it stays warm through the rain. A light hooded shell that folds into its own pocket ends up in the day bag instead of the hotel room.
See the Weather Protection packA charged power bank
Power cuts follow storms. A charged bank keeps maps, bookings and your ability to call someone alive through one.
See the Tech & Power Essentials pack
Build a packing plan around the season you are actually travelling in.