Traveling to Japan in summer (May-October): the honest reality of heat, humidity, and typhoons

If you are planning a trip to Japan between May and October, this article is for you. And the first thing worth knowing, before reading on, is that not all months in that range are equal. The difference between May (one of the best months of the year) and August (one of the toughest for an unprepared tourist) is enormous.

Let us be honest from the start: if you can still choose when to travel and your priority is enjoying the country without suffering, avoid July and August. The combined temperature and humidity make daytime sightseeing exhausting, and the most popular spots are packed with Japanese visitors on school holidays. May and October are, within this range, the ideal months.

But let us also be useful: if you already have the trip booked, your only annual vacation slot falls during peak tsuyu in June, or that friend who can only travel in August convinced you — no worries. Japan in summer is perfectly enjoyable. You just need to know what you are walking into and plan accordingly. That is what this article covers.

The calendar at a glance

These are the official Japan Meteorological Agency figures for Tokyo over the past decade. Kyoto and Osaka are 2-3°C hotter and even more humid because they sit in inland valleys. Hokkaido is 8-10°C cooler and far less humid. If your itinerary covers multiple regions, keep this in mind: what holds for Tokyo does not hold for all of Japan.

Why 30°C in Tokyo isn’t the 30°C you know from home

Before getting into each month, a mandatory section. If you are coming from a dry-summer climate (Madrid, Los Angeles, Phoenix, most of inland Australia, southern Europe), you must understand this before packing your bags. Underestimating the difference is what sends thousands of tourists to the hospital every summer.

The explanation is purely physical. When your body gets hot, it cools itself by evaporating sweat. The temperature you feel does not depend only on the thermometer — it depends on how quickly your sweat can evaporate. And that depends almost entirely on the humidity of the air.

Compare three summer conditions of roughly similar nominal temperature:

• Madrid in July: ~33°C, 20-25% humidity → sweat evaporates very fast, you cool down, your clothes stay dry most of the day
• Miami in July: ~32°C, 75% humidity → sweat barely evaporates, you stay damp, real-feel rises significantly above the air temperature
• Tokyo in July: ~29°C, 80% humidity → the heat index can climb to 37-40°C — your body experiences something close to peak Miami summer, despite the lower thermometer reading

The thermometer reads cooler in Tokyo, but the heat index (what your body actually experiences) can be 8-10°C HIGHER than in Madrid. A day of sightseeing in Kyoto in July physically feels like a day in Phoenix at 40°C in August — except put through a washing machine.

This has practical consequences:

• What you would do in a dry climate without thinking (walking eight hours seeing landmarks) can land you in the hospital in Tokyo in July
• The clothes that work for European or Californian summer (cotton, short sleeves, and call it good) get soaked in 20 minutes
• The “leave early, rest at midday, head out again in the afternoon” strategy that works in Mediterranean climates becomes “leave before 9 a.m., stop from 11 to 5, head out only after 6 p.m.”

If your mind is calibrated to “I handle the 35°C of my hometown just fine,” approach July or August Japan with humility. The Japanese climate doesn’t work the way you are used to.

Month by month

May: the ideal month, but the crowds know it

May is one of the two best months to visit Japan (along with October). Mild temperatures (23°C average maximum), still-moderate humidity (72%), 10 rain days spread out manageably. Days are long, cherry blossoms have passed but hydrangeas start to appear by month’s end, and the spring light is gorgeous for photography.

The catch: everyone knows it. May falls after cherry blossom season, but Golden Week (大型連休, from April 29 to May 5) is the busiest holiday period of the year for Japanese travelers themselves. If your trip lands in those exact dates, expect:

• Shinkansen trains at 200% capacity (literally — people standing in the corridors between cars)
• Hotels at double price
• Famous temples with 2-hour waits
• Restaurants slammed at hours that are normally empty

Practical advice: if you can plan your trip to arrive after May 8, everything changes. Japanese crowds return to work, prices drop to normal, and you enjoy Tokyo and Kyoto with ideal weather and locals back in their usual rhythm.

June: welcome to tsuyu

June is the month of tsuyu (梅雨), the “plum rain season.” It is not a violent tropical monsoon — it is a persistent drizzle, almost continuous for several weeks, interspersed with gray and humid days. It typically begins between June 7 and 11 in Kantō (Tokyo) and ends around July 19-21.

Does it rain all day for six weeks? No. The reality of tsuyu:

• It rains at some point on most days, but rarely all day
• Ambient humidity climbs to 78% on average — clothes don’t fully dry overnight
• Temperatures are moderate (26°C max), but the muggy feeling is strong
• Hydrangeas (紫陽花, ajisai) are in full bloom — temples with hydrangea gardens (like Meigetsu-in in Kamakura) are stunning
• Fewer international tourists, reasonable prices

Things that work in tsuyu:

• Museums, galleries, aquariums — all indoor Japan is perfect
• Visiting temples with hydrangea gardens
• Onsen (hot springs feel better when it’s cool and humid outside)
• Shopping (covered passages between train stations and malls are everywhere)

Things that DON’T work well:

• Mountain hiking (slippery and with cloudy views)
• Mount Fuji visits (you’ll see it wrapped in fog 90% of the days)
• Outdoor festivals (many are rescheduled)

Essential gear for tsuyu: a good-quality compact umbrella (not the konbini junk that breaks after 3 hours), water-resistant shoes (not canvas sneakers), and at least two pairs of socks to change.

July: the real difficulty begins

From the second half of July, tsuyu ends and the hard summer begins. The temperature rises to 29°C max, humidity stays at 80%, and rainless days are so hot that you actively seek out shade.

Some numbers for context: in summer 2024, Japan recorded 2,033 heatstroke deaths, the historical record since record-keeping began. Nearly 100,000 people were hospitalized between May and September. About 60% of those affected were over 65, but the other 40% includes young and healthy people — including foreign tourists who underestimated the conditions.

The Japanese government has an official heatstroke alert system (熱中症警戒アラート) that activates when the WBGT index exceeds 33. In 2024, 1,722 alerts were issued, triple the number from three years earlier. If you travel in July or August, download the Ministry of the Environment app (環境省熱中症予防情報サイト) or check it every morning before planning your day.

What you can expect from a typical day in Tokyo or Kyoto in July:

• 8:00-10:00 a.m.: still manageable. If you are visiting popular temples, this is the time
• 10:00 a.m.-12:00 p.m.: temperature rises fast. If you’re outside, seek shade constantly
• 12:00-4:00 p.m.: critical hours. Stay indoors with air conditioning whenever possible
• 4:00-7:00 p.m.: the sun goes down but the accumulated heat lingers. Still tough
• 7:00 p.m. onward: the atmosphere becomes “manageable” — there’s still humidity but it’s no longer dangerous

Good July events: the hanabi taikai (summer fireworks) are unique. The Sumida River Hanabi (last Saturday of July) draws a million people. If you can go, go. Festivals like Gion Matsuri in Kyoto (all of July, main parades on the 17th and 24th) are culturally impressive.

August: the peak

If July is hard, August is the peak. 31°C average maximum, days above 35°C increasingly frequent, “tropical” nights where temperature doesn’t drop below 25°C. The city feels like a sauna.

Add to this Obon (お盆), the mid-August holiday when Japanese people return to their hometowns. Roughly August 13-16, big urban centers partially empty out — but trains to the countryside (especially shinkansen from Tokyo westward) are packed and hotels in tourist spots like Hakone or Nikko fill up at high prices.

You’ll notice two cultural things if you walk around the city in these months:

Japanese women systematically protect themselves from the sun. You’ll see many women wearing long sleeves even at 33°C, carrying handheld parasols (日傘, higasa) opened on the street, wearing gloves up to the elbows, wide-brim visors, and masks not for covid but to cover skin. This isn’t eccentricity — it’s deliberate sun protection. Japanese culture values pale skin and they also know perfectly well what the sun can do in July-August. If you have sensitive skin (especially redheads or very fair-skinned people), consider adopting part of this strategy.

Japanese people drink water constantly. You’ll see vending machines every 100 meters, people with small bottles in hand at all times, and signs at stations reminding you. Hydration is not optional in Japanese summer.

Personal anecdote: the first year we came to Japan, sixteen years ago now, we went to Kyoto for a few days in high summer. The first day we walked temple to temple without thinking much about the sun — hat, yes, but the “normal” sunscreen we used back home in Spain. That night, when we showered, our skin was completely red, burned from shoulders to forearms. Full-on sunburn. We went to a neighborhood pharmacy and, with no Japanese, had to explain through gestures and showing the skin that we needed after-sun cream. The pharmacist was kind but the language barrier made it take twenty minutes to find the right product. The lesson: in Japan the sun hits harder than it looks (Kyoto’s UV index in July is comparable to Madrid’s in August), and the key words for a pharmacy emergency are 日焼け (hiyake, sunburn) and アフターサンクリーム (after-sun cream).

September: the deceiving month

September markets itself as “summer is ending, finally bearable.” And it’s partially true: the temperature drops to 27°C average max, extreme heat days are less frequent, and at night you can finally breathe.

But September has two important catches that many tourists don’t expect:

1. Humidity is at its peak. With 81% average humidity, September is the most humid month of the year in Tokyo, even more than July or August. This means that although the thermometer reads 27°C, the muggy feeling can be similar to July. Many tourists who travel in September complain more about the climate than those who go in August — because they expected “summer is over” and found themselves with slow, sticky days, no relief.

2. Typhoon season. Typhoons (台風, taifū) affect Japan mainly from August to October, peaking in September. A typical typhoon arrives with 3-4 days of advance warning (the Japan Meteorological Agency is excellent at predicting them), but when it arrives, it paralyzes the country:

• Cancelled flights (especially from Narita and Haneda)
• Shinkansen suspended on affected lines
• Local trains out of service for 12-24 hours
• Closed shops, restaurants with reduced hours
• Official recommendation: stay inside your hotel during the typhoon

If you travel in September, check the weather forecast every day (you can use tenki.jp in English). If you see a typhoon approaching, don’t try to “make the most of the day before” — typhoon preparations happen 24-48 hours ahead and, if a typhoon catches you between cities, you can be stranded in a station for an entire day. Better to anticipate and stay somewhere safe.

The good thing about September: there are fewer foreign tourists, prices drop, days are shorter (the sun sets earlier, giving you more cool afternoon hours), and toward month’s end the first autumn leaves start appearing at higher altitudes (Nikko, Tohoku mountains).

October: the second ideal month

October is the other great month to visit Japan. Temperatures fall to 22°C max, humidity finally drops to 76%, sunny days become frequent, autumn leaves (紅葉, kōyō) start appearing in the mountains by month’s end.

The catch: October is also typhoon season, especially the first half. The last big typhoon of the season typically arrives between October 5 and 20. After that, the weather stabilizes into what many consider the most pleasant weeks of the year.

October autumn leaves are still in their early stages — the peak of kōyō in Tokyo is mid-to-late November, and in Kyoto early December. If you want to see autumn leaves at their best, October is premature for the big cities, but perfect for mountain areas like Nikko, Hakone (medium altitude), and especially Hokkaido (where autumn arrives a month earlier).

How to plan your day in extreme heat

If your trip falls in July or August, this is the time structure that works to survive and enjoy:

Morning (6:00-10:00 a.m.): the golden hours. Famous temples like Fushimi Inari, Kiyomizu-dera, or Senso-ji are relatively empty and the temperature is manageable. If you can get up early, this completely changes your trip.

Mid-morning (10:00 a.m.-12:00 p.m.): it starts to bite. If you’re still outside, find shade and drink water every 30 minutes. This is the ideal time to enter a museum or air-conditioned café.

Midday and afternoon (12:00-4:00 p.m.): the critical hours. Don’t spend them on the street sightseeing. Good options:

• A slow meal in an air-conditioned restaurant
• Museums (Tokyo National Museum, Ghibli Museum, Nezu Museum)
• Aquariums (Sumida Aquarium, Sunshine Aquarium)
• Shopping malls (Roppongi Hills, Tokyo Midtown, Lucua in Osaka)
• Indoor onsen or sento (paradoxical but real: hot water activates sweating, you come out refreshed)
• Your hotel, resting — travel is exhausting and the body recovers

Late afternoon (4:00-7:00 p.m.): the sun goes down but the ground and buildings radiate accumulated heat. Real temperature is still high. Good time for water areas (rivers, lakes) or parks with trees.

Night (7:00 p.m. onward): the best part of the day in summer. Temperatures are manageable, Tokyo’s lights are perfect for photos, izakayas open, hanabi (fireworks) are a unique experience. Japanese summer is enjoyed at night.

What to bring (and what to buy on arrival)

Bring from home:

• Lightweight cotton clothing in light colors (black absorbs heat)
• Quick-dry technical T-shirts — surprisingly useful
• Breathable comfortable footwear (you’ll sweat a lot inside)
• High-protection sunscreen (SPF 50+ minimum)
• Hat or cap with brim
• A light sweater or cardigan — Japanese air conditioning runs at full blast and indoor temperatures can drop to 22°C

Buy on arrival (much cheaper and better suited to local climate):

• Quality compact umbrella (any konbini has them for ¥500-800, but invest ¥1,500 in a good one)
• Small hand towel (タオル, taoru) — all Japanese people carry one in summer to wipe sweat. Daiso or any supermarket
• Sports drinks: Pocari Sweat and Aquarius are the icons, ¥150 at any konbini. If you sweat a lot, they’re more effective than plain water
• Cooling spray (冷却スプレー, reikyaku spray): sprayed on skin or clothes for immediate cooling. At pharmacies and konbini
• Disposable cooling towels (冷たいおしぼり) — come in individual packets
• After-sun cream if you burn: look for アフターサンクリーム or ask at a pharmacy (キュレル, Curel, is a reliable brand)
• Parasol (日傘, higasa): if you’ll be outdoors a lot. They start at ¥1,500 in department stores. Even if you feel weird at first, it’s one of the most effective inventions against sun — Japanese people don’t use it by chance

Heatstroke (熱中症): the serious risk

Heatstroke is the real medical emergency of a Japanese summer. It’s not theoretical: the healthcare system is prepared because it happens to thousands of people each summer, including tourists.

Symptoms in order of severity:

1. Mild: dizziness, headache, muscle cramps, intense thirst, excessive sweating. Action: go somewhere with air conditioning, drink fluids with salts, rest at least 1 hour
2. Moderate: vomiting, muscle weakness, fever, cold clammy skin or red hot skin, difficulty concentrating. Action: go to the emergency room of the nearest hospital (病院, byōin), ask for help immediately
3. Severe: loss of consciousness, seizures, body temperature above 40°C, severe confusion. Action: call 119 (emergencies) immediately

Prevention:

• Drink water even before feeling thirsty
• If you’ll be outside more than 2 hours, alternate water with sports drinks
• Avoid alcohol during the day — it dehydrates
• Wear a hat, seek shade
• If you feel dizzy, stop immediately and get under cover
• On public transport, always carry something to drink

If you have a medical emergency: the number is 119 (ambulance and fire, free from any phone). The operator may not speak perfect English, but by saying “熱中症” (nettōchūshō) they’ll understand heatstroke. Your hotel can also help you contact medical services.

Summer events that ARE worth it

Despite all this, Japanese summer has unique things. If your trip falls in these dates, don’t miss:

Hanabi taikai (花火大会): fireworks festivals all across the country from late July through August. The most famous are Sumida River Hanabi (Tokyo, last Saturday of July), Naniwa Yodogawa Hanabi (Osaka, early August), and Lake Biwa Hanabi (near Kyoto, early August). Ridiculous quantity of fireworks, locals dressed in yukata (light kimono), unique atmosphere. Arrive early, bring a mat.

Matsuri (traditional festivals): every neighborhood has one. The most spectacular of the season: Gion Matsuri in Kyoto (all July, parades 17 and 24), Tenjin Matsuri in Osaka (July 24-25), Awa Odori in Tokushima (August 12-15), and the Aomori Nebuta Matsuri (August 2-7).

Obon (お盆): August 13-16. While big cities empty out, in towns there are traditional dances (盆踊り, bon odori). A genuine way to see rural Japan.

Rooftop beer gardens: big Japanese cities have beer gardens (ビアガーデン) set up on hotel rooftops and shopping centers. Cold beer with urban views — the best evening version of Japanese summer. Book in advance.

If you can escape: Hokkaido and cooler areas

If your trip is long (10+ days) and falls in July-August, consider including Hokkaido in your itinerary. The northern island has a radically different climate:

• Sapporo in August: average max 26°C, 75% humidity — manageable
• Furano and Biei (central Hokkaido): lavender fields in July, beautiful landscapes, cool temperatures
• Daisetsuzan National Park: high-altitude hiking in cool climate

Short flights from Tokyo (1h30), or shinkansen + Sapporo (4-5h). If you have 3-4 days available, spending part of your trip in Hokkaido is the best thing you can do to escape the heat.

Other escapes within Honshu:

• Karuizawa (1h by shinkansen from Tokyo): mountain town at 1,000m altitude, temperatures 5-7°C lower than Tokyo
• Hakone: the famous hot springs valley sits at around 700m, slightly cooler
• Nikko: mountain area with temples, cooler due to altitude
• Lake Kawaguchi: Mount Fuji views, altitude and fresh air

Frequently asked

Is it worth going to Japan in summer if I’m on a tight budget?

Yes. Prices are noticeably lower than in spring (cherry blossoms) or autumn (kōyō). Flights can be 30-40% cheaper, hotels too. If your budget is limited and your health allows you to handle the heat with planning, July-September can be the right choice.

What about small children or elderly people?

With extra care. Children under 5 and adults over 65 are more vulnerable to heatstroke. If you’re traveling with them, absolutely prioritize May, June, late September, or October. If you must go in July-August, plan with extreme caution: short outdoor times, constant hydration, long breaks in air conditioning, and a plan B in case of symptoms.

Is there a useful app for temperatures and alerts?

Yes: the official Japanese Ministry of the Environment app (環境省熱中症予防情報サイト) has heatstroke alerts by prefecture. There’s also tenki.jp in English. For typhoons, we recommend the official Japan Meteorological Agency site (jma.go.jp/en).

What about rain? Does it really rain that much in tsuyu?

Statistically, June has 12 rain days, July 11. But they’re not full days of continuous rain: typical is 2-4 hours of rain a day, interspersed with dry periods. The reality of tsuyu is less catastrophic than its reputation.

Are Japanese air conditioners as cold as people say?

Yes. Japanese shops and restaurants in summer are between 22-24°C. Trains and buses, similar. This brutally contrasts with the street (35°C, 80% humidity). The repeated thermal shock is exhausting — always carry something to cover up indoors.

Is climbing Mount Fuji safe in summer?

The official Mount Fuji season runs July 1 to the first weekend of September. It’s the only time of year you can legally climb. The ascent is physically demanding but accessible for moderately fit people. Important 2024 update: fees were introduced (¥2,000 per person) and quotas on the Yoshida trail to prevent over-tourism. Book in advance.

My trip falls in peak tsuyu. Should I cancel?

No. Tsuyu has its own magic: hydrangeas in bloom, the atmosphere of damp bamboo in Arashiyama, outdoor onsen with mist, fewer tourists. You just need to adjust expectations: fewer panoramic landscapes, more indoor and intimate experiences.

What happens if a typhoon catches me?

Stay at the hotel. Japanese typhoons are intense but predictable and relatively quick to pass (12-36 hours). Your hotel will know how to orient you. Travel insurance usually covers flight changes and extra nights due to typhoon — keep all cancellation documentation.

A note on this article

Weather data comes from the Japan Meteorological Agency, past-decade averages (2016-2025) for Tokyo. Heatstroke figures come from official reports by the Ministry of Health, Labour and Welfare and the Fire and Disaster Management Agency of Japan. If you have health concerns (cardiovascular issues, pregnancy, advanced age), consult your doctor before traveling to Japan in July-August. The situations we mention (severe heatstroke, typhoons) are real and deserve respect, but with proper planning and awareness of the environment, Japan in summer is a perfectly enjoyable experience. You just need to arrive informed.

If you want to calculate a realistic budget for your trip during these dates, you can use the Japan trip budget calculator.