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Summer in Japan can be one of the most rewarding times to visit, but it is also one of the most challenging. Between intense humidity, high temperatures, and the rainy season, you may be surprised by how exhausting summer travel can feel.
After spending over 10 years living in Japan and traveling across the country from Hokkaido to Kyushu during peak summer, I’ve learned that enjoying the season is less about avoiding the heat and more about preparing for it. In this guide, I’ll explain what summer weather is really like in Japan, what to wear and pack, and the practical strategies I use to stay comfortable while sightseeing during the hottest months of the year.
When Is Summer in Japan?
Summer in Japan lasts from June to August. The period from mid-June to early July is known as tsuyu (rainy season), bringing frequent rain, cloudy skies, and high humidity across much of the country. Temperatures are milder, with daytime highs between 25 and 30°C (77 and 86°F).Â
However, once the rainy season ends in July, temperatures and humidity rise sharply. July and August are the hottest months, with daytime temperatures regularly exceeding 30°C (86°F), especially in major cities.
Why Summer in Japan Feels So Intense
Many travelers underestimate just how exhausting summer in Japan can feel. While temperatures regularly exceed 30°C (86°F), the biggest challenge is usually the humidity. High moisture levels make it harder for sweat to evaporate, which means even short walks can feel draining.
Japan’s cities can also intensify the heat. Large concrete metropolises like Tokyo, Osaka, Kyoto, and Fukuoka exacerbate the heat, with limited shade and crowded public transport systems that trap heat throughout the day. Add in long sightseeing days, stairs at train stations, and hours spent walking between attractions, and summer fatigue builds up quickly.
What Is Summer Weather Like in Japan?
Temperature by Month
Temperatures vary depending on where you are in Japan, but most major cities experience the following daytime highs:
- June: 25–30°C (77–86°F)
- July: 30–35+°C (86–95+°F)
- August: 30–37°C (86–99°F)
Larger cities will feel significantly hotter due to their urban density. Northern regions, including Hokkaido, are generally cooler, although recent summers have still seen temperatures climb above 35°C (95°F), with some areas occasionally approaching 39°C (102°F) in 2025. The good news is that the most intense heat tends to be shorter-lived than in central and southern Japan.
Humidity Levels
Having lived in Tokyo and Hokkaido and spent a substantial amount of time in Kyushu, I find humidity the most challenging part of traveling to Japan in summer. Even when temperatures are below 30°C (86°F), the air can feel heavy and sticky.
During late July and August, humidity levels frequently exceed 80%, making it feel significantly hotter than the actual temperature. Many travelers, including myself, find the humidity more difficult than the heat itself. Even standing still at a train platform or walking a few minutes between stations can leave you drenched in sweat.
Rainy Season (Tsuyu)
The rainy season typically runs from mid-June to early July across much of Japan. During this period, expect frequent rain, overcast skies, and occasional heavy downpours. It does not rain constantly, but I recommend being prepared for such conditions. The rainy season can make temperatures feel slightly cooler, but the humidity increases significantly. One bonus of the rainy season is the blooming of the beautiful hydrangeas across the country!
Typhoon Season
Typhoon season usually starts during the latter half of Summer, around late August to September. It’s more likely than not that you will not encounter a major typhoon. However, they can cause flight delays, train disruptions, ferry cancellations, and temporary attraction closures. If you’re visiting Japan in late summer, I recommend checking the latest forecasts from the Japan Meteorological Agency before and during your trip, and monitoring any transport announcements from your airline or railway operator beforehand.
What to Wear in Summer in Japan
The most important thing during summer in Japan is wearing breathable, lightweight clothing. Loose-fitting T-shirts, linen shirts, shorts, skirts, dresses, and airy pants all work well. Natural fabrics like cotton and linen are usually more comfortable than thicker materials. I recommend moisture-wicking clothing like UNIQLO’s Airism series during summer, especially for long sightseeing days, as the humidity can become exhausting.Â
Comfortable walking shoes or open-toe sandals are essential, as you’ll likely spend hours exploring cities, climbing stairs at stations, and sightseeing outdoors.
For extra comfort, consider:
- A hat or cap for sun protection
- Sunglasses and sunscreen
- UV arm covers or lightweight layers for sun protection
- Spare shirts if you plan long sightseeing days
Essential Items for Surviving Summer in Japan
Cooling Items
- Cooling wipes
If there’s one purchase you should make, it’s cooling wipes from a convenience store. They help remove sweat, cool your skin, and make long sightseeing days much more comfortable. - Portable fan
Small handheld or neck fans are everywhere in Japan during summer for a reason. However, I found that the cheap ones aren’t very useful. Try to find a high-quality one if you plan to buy. - Neck cooling ring/towel
Cooling rings and cooling towels can make a surprisingly big difference during long periods spent outdoors at festivals, theme parks, or sightseeing spots with limited shade. - Hand towel
You will sweat far more than expected. I recommend having a small hand towel on hand to wipe away any sweat around your neck and face.
Sun Protection
- Sunscreen
UV levels are intense during July and August, even on cloudy days. Make sure you keep applying sunscreen throughout the day. - Hat or cap
Shade is limited in many sightseeing areas, especially around temples, shrines, and city streets. - Sunglasses
Useful for both comfort and reducing eye strain during long days outside. - UV umbrella/parasol
Very common in Japan and surprisingly effective. A parasol can noticeably reduce how hot you feel while walking around cities.
Rain Protection
- Compact umbrella
If you’re coming in June, having a compact umbrella on hand is always useful. You can also buy a regular umbrella at any convenience store. - Light rain jacket
Useful for hikes, theme parks, or days with unpredictable weather. - Waterproof bag cover
Protect cameras, passports, and electronics from sudden rain showers.
Convenience Items
- Portable battery
Heat drains phone batteries faster, especially when using maps, translation apps, and cameras all day. - Spare shirt or socks
Changing into dry clothes halfway through the day can make a huge difference during humid weather.
Tips for Visiting Japan in Summer
Hydrate
It may sound obvious, but hydration is absolutely paramount. Japan’s convenience stores and vending machines are your best friends during the summer. Make sure to drink plenty of water and electrolytes. Water and sports drinks like Pocari Sweat and Aquarius are widely available and help replace fluids lost through sweating. Make sure you regularly drink throughout the day. Don’t wait until you’re thirsty.
Plan Around the Heat
Try to visit outdoor attractions early in the morning or later in the afternoon. Use the hottest part of the day for museums, shopping centers, cafes, or lunch breaks in air-conditioned spaces.
Take More Breaks Than Usual
Traveling around in summer is more physically demanding than you might expect. One thing I regularly do during the summer is use convenience stores, or even a department store, as short cooling breaks. Stores like 7-Eleven, FamilyMart, and Lawson are everywhere, air-conditioned, and sell cold drinks, ice cream, cooling wipes, and sports drinks. Spending five or ten minutes to cool down can make a huge difference on long travel days.
Listen to Your Body
Heatstroke is common during the summer in Japan. Do not take it lightly. If you start feeling dizzy, nauseous, unusually tired, or develop a headache, find air conditioning immediately, drink water, and rest.
Don’t Overpack Your Itinerary
This combines everything said above. When planning your trip, you need to consider time spent taking breaks. It is challenging to travel the same way you would in spring as you would in August. Do not overpack your itinerary. Avoid scheduling and reserving too many activities and keep your schedule flexible.
Why You Should Visit Japan in Summer
While summer is one of the most challenging seasons to visit Japan, do not let that discourage you. Summer is matsuri (festival) season, so you can expect to see plenty of fireworks, parades, and dancing at local festivals. From the colorful floats of the Nebuta Matsuri in Aomori to the chaotic parades of Osaka’s Tenjin Matsuri, there’s an energy and atmosphere that you can’t experience during other times of the year.
It is also one of the best times to explore Japan’s natural landscapes. The countryside becomes incredibly green, mountainous areas offer cooler climates, and destinations such as Hokkaido, the Japanese Alps, and many national parks are at their most beautiful. Beach destinations in Okinawa, Kamakura, and other coastal regions are also at their peak during summer.
Is Summer in Japan Worth Visiting?
Yes, but only if you know what to expect. After spending multiple summers in Japan, I think the biggest mistake travelers make is treating summer sightseeing the same way they would in spring or autumn. I often found myself doing this and would feel completely exhausted. While summer isn’t the most comfortable season to visit Japan, it offers experiences you can’t get at other times of the year. From fireworks and countless matsuri to beach escapes and vivid green landscapes, summer really is a beautiful season.
Personally, I wouldn’t recommend summer as a first choice for most first-time visitors, especially if you have the flexibility to visit in spring or autumn. However, if summer is the only time you can travel, don’t let the heat put you off. Using these tips, you can still have a summer trip of a lifetime.
