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執筆者の写真Narelle Katsumoto

All About Japan’s 5th Rainy Season-Tsuyu


All About Japan’s 5th Rainy Season-Tsuyu

Coming between June and July, you’ll experience consistent rain showers throughout the day and sometimes even for a whole week. This is Japan’s rainy season, or what the locals call tsuyu (梅雨). While some deem it the fifth season, tsuyu is the precursor to summer, giving the country the rain it needs before the heat settles in. So, if you’re planning to visit Japan or travel domestically during this time, here’s something you should know before you start booking!


What is tsuyu? When is it?


The kanji of tsuyu is 梅雨, which, if directly translated, means “plum rain.” This originates from when plums were harvested in Japan, coinciding with the onset of this rainy season. This period marks the transition in weather patterns as Japan moves from the cooler spring to the hotter summer months.


Tsuyu typically occurs from early June to mid-July, although the exact timing can vary slightly depending on the region. The season generally begins around June 1st and lasts until July 15th. This period marks a transition from the cooler, dry conditions of spring to the hotter and more humid conditions of summer. Although tsuyu can coincide with Japan’s typhoon season, they are not the same. So, don’t worry if you’re traveling to Tokyo! Tokyo seldom experiences typhoons in the summer.


In southern Japan, such as in Okinawa, tsuyu may start earlier in May and end sooner in June. In contrast, in northern regions like Hokkaido, the rainy season may begin and finish later, sometimes extending into early August. Understanding the local climate patterns can help you better prepare for your visit or activities during this season.



In Japan, several terms describe the different phases of the tsuyu season. The shift from spring into the rainy season is known as "nyubai." As this transition occurs, the country enters the tsuyu period. During tsuyu, there are intervals of sunny days, referred to as "tsuyu no nakayasumi." This rainy season eventually concludes with what locals call "tsuyuake" or "shutsubai."



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What happens during tsuyu?


As Japan transitions into tsuyu, or the rainy season, the atmosphere becomes drenched with moisture due to seasonal wind patterns shifting. This results in continuous rainfall, which can range from light drizzles to intense downpours, frequently persisting for several days. 


The arrival of tsuyu brings noticeable changes to both daily life and the weather in Japan. Although tsuyu is known for its frequent rain, it doesn't mean it rains non-stop. During sunny days, temperatures can rise significantly, and the high humidity increases the risk of heatstroke. On the other hand, prolonged rainy periods can cause temperatures to drop rapidly. With this in mind, it is crucial to stay mindful of your health throughout this season. Many Japanese people do get sick during this time. On a lighter note, the already humid climate in Japan becomes even more pronounced during tsuyu, creating an ideal environment for mold and other bacteria to thrive. 


The increased rainfall raises humidity levels, making the air feel heavier and stickier. This consistent wet weather can impact outdoor activities, travel plans, and daily routines. While the rain offers a welcome change from the dry spring months, it can also bring challenges such as flooding, landslides, transportation delays, and muddy conditions. Keeping yourself updated with the weather forecasts and preparing for the season is key to enjoying the tsuyu season.



Despite the inconveniences, tsuyu is crucial for Japan’s ecosystem. The rain is vital for replenishing rivers, lakes, and reservoirs, which are essential for drinking water and agriculture. It also supports the growth of crops, including rice, a staple in Japanese cuisine, and contributes to the vibrant greenery that characterizes the Japanese countryside in summer.


How to prepare for tsuyu?


If you want to make the most of your plans during this season, it's important to prepare for the weather. Ensuring you stay comfortable and dry throughout your day is key. Here are some handy tips to help you do just that:


  • Rain Gear: A high-quality, wind-resistant umbrella is essential, along with a durable raincoat or waterproof jacket with a hood. These items will keep you dry during sudden downpours and make navigating the rainy streets a breeze. 





  • Waterproof Footwear: Waterproof shoes or boots, such as rubber boots or waterproof hiking shoes, are highly recommended to keep your feet dry and prevent slipping on wet surfaces. Trust us, dry feet make all the difference!




  • Lightweight and Breathable Clothing: Opt for lightweight and moisture-wicking clothing to stay cool and comfortable in the high humidity. Think of quick-drying fabrics that keep you feeling fresh all day long! Uniqlo has a great AIRism line that helps keep you cool throughout the day.





  • Waterproof Bags: Use waterproof bags or covers to protect your belongings from getting soaked. A waterproof backpack cover or a dry bag can be particularly useful for keeping your electronics and important items safe.




  • Bug Repellent: The humid conditions can lead to an increase in insects, so having insect repellent on hand is highly advisable especially if you plan on hiking or going to nature. A good bug spray will keep those pesky mosquitoes at bay.





  • Cold medicine: Due to the inconsistent cool and dry temperatures, it’s a good idea to have cold medicine on hand. Sudden weather changes can make you more susceptible to colds, so being prepared can help you manage any symptoms that arise.




  • Hydration: Staying hydrated is crucial, especially in humid conditions. Drink water and sports drinks regularly to keep yourself well-hydrated. Although convenience stores and vending machines are more convenient, it’s much cheaper to buy from drug stores and supermarkets.




  • Sunscreen: Even on cloudy days, UV rays can penetrate the clouds and cause sunburn. Apply a broad-spectrum sunscreen to protect your skin and prevent sun damage.




If you're traveling to Japan, you don't need to pack these items—Japan’s convenience stores have you covered! You can pick up a sturdy umbrella and a waterproof raincoat for less than 1,000 yen each. Just be sure to attach a keychain or accessory to your umbrella so you can easily spot it among the many identical ones. You can also find breathable shirts for under 2,000 yen each. However, we do recommend bringing waterproof shoes, as they can be pricier depending on where you shop.


Understanding and preparing for tsuyu can really enhance your experience during this unique season in Japan. If you can help others on your journey while you are protecting yourself from the elements, don't forget to pay it forward! Whether you’re exploring the beautiful sights or just curious about the local climate, being prepared will help you enjoy this rainy and refreshing time to the fullest. Happy travels!




Picture Sources:

  1. https://cotoacademy.com/tsuyu/

  2. https://pixabay.com/photos/rain-people-umbrellas-wet-weather-7995866/

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  7. https://www.uniqlo.com/jp/ja/products/E464450-000/00?colorDisplayCode=04&sizeDisplayCode=004

  8. https://www.uniqlo.com/jp/ja/products/E454312-000/00?colorDisplayCode=00&sizeDisplayCode=004

  9. https://static.gopro.com/assets/blta2b8522e5372af40/blt4dda14ea2ddd52e0/628e3f098e88d660b6a15adf/pdp-storm-module-image-4-768-2x.png

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  16. https://pixabay.com/photos/tokyo-woman-market-city-people-4436914/


Sources:

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