Japan experiences distinct weather patterns in each season, and one of the most defining is “Tsuyu” , the rainy season that arrives in early summer. This season plays a significant role in Japan’s natural environment and daily life.
While the prolonged rain and high humidity can feel daunting for travelers, Tsuyu also brings unique beauty: lush, rain-soaked gardens, verdant forests, and vivid blooms of hydrangeas (ajisai) that transform Japan’s landscapes into something truly special. The season also tends to offer a quieter, more relaxed atmosphere at popular destinations.
In this article, we explain the origins of the word “Tsuyu,” the meteorological factors behind its rainfall, and a general timeline for when the rainy season occurs across Japan. We also introduce four recommended destinations where you can enjoy your trip comfortably even during Tsuyu — so if you’re planning a visit to Japan, read on.
1. Japan Has a Rainy Season!
Every year in early summer, Japan enters a rainy season known as Tsuyu. During this period, sunny days become less frequent, and overcast skies and rainfall become the norm.
While the unpredictable weather may be a concern for travelers, Tsuyu also offers its own kind of charm — beautiful natural scenery and seasonal flowers that can only be seen at this time of year. Here, we explore the origins of the word “Tsuyu” and why the season brings so much rain.
1-1. The Origins of the Word “Tsuyu”
The word “Tsuyu” is believed to have originated in China.
Around May to June, plum trees bear ripe fruit — and since rainfall is particularly heavy during this period, one theory holds that the season came to be called “the rain of the plum.” Another theory suggests the original term was “baiu,” written with the character for mold, reflecting the damp conditions that encourage mold growth. Over time, the character for plum — which shares the same pronunciation — replaced it, giving us the modern written form.
In Japan, the custom of reading the characters as “Tsuyu” is said to have spread from around the Edo period (17th–19th century). Several explanations have been proposed: one links it to the word for “dew” (tsuyu), evoking how moisture collects on plant leaves during this season; another suggests it derives from the image of ripe plums bursting open.
1-2. Why Does So Much Rain Fall During Tsuyu?
The heavy rainfall of Tsuyu is caused by the interplay of atmospheric airflows and high-pressure systems.
As early summer arrives, the Pacific High — a warm, moisture-laden air mass — extends northward toward Japan from the south. At the same time, the Okhotsk High, a cold air mass, pushes southward from the north. When these two air masses with contrasting characteristics collide over the Japanese archipelago, a stationary front called the “Baiu Front” (Tsuyu zensen) forms. Near this front, warm air rises to form clouds, creating persistent rain-prone conditions. As the Pacific High strengthens and pushes the front northward, Tsuyu eventually comes to an end.
This atmospheric mechanism is why Japan experiences a rainy season at roughly the same time every year. It is also worth noting that this rainfall is a vital natural phenomenon, supporting the growth of crops and vegetation.
2. When Does Japan’s Tsuyu Begin and End?
高松地方気象台は２７日、四国地方が梅雨明けしたとみられると発表した。四国で６月中に梅雨が明けるのは初めてで、昨年と平年よりも２０日程度早い。梅雨の期間は最短の１９日間。#梅雨明け#四国地方#高松地方気象台pic.twitter.com/qJMvjvev6W
— 四国新聞社 (@shikokunews) June 27, 2025
The heavy rainfall of Tsuyu is caused by the interplay of atmospheric airflows and high-pressure systems.
As early summer arrives, the Pacific High — a warm, moisture-laden air mass — extends northward toward Japan from the south. At the same time, the Okhotsk High, a cold air mass, pushes southward from the north. When these two air masses with contrasting characteristics collide over the Japanese archipelago, a stationary front called the “Baiu Front” (Tsuyu zensen) forms. Near this front, warm air rises to form clouds, creating persistent rain-prone conditions. As the Pacific High strengthens and pushes the front northward, Tsuyu eventually comes to an end.
This atmospheric mechanism is why Japan experiences a rainy season at roughly the same time every year. It is also worth noting that this rainfall is a vital natural phenomenon, supporting the growth of crops and vegetation.
3. Is It Worth Visiting Japan During Tsuyu?
Yes — Japan is absolutely worth visiting during the Tsuyu season.
Temperatures during this time are relatively mild. In June, highs typically hover around 22–28°C (72–82°F), making for comfortable conditions. By July, the humidity and heat increase, with temperatures sometimes reaching 28–32°C (82–90°F), but all-day downpours are uncommon — most days feature brief showers or overcast skies rather than constant rain.
Rain-soaked gardens and forests take on a vibrant, deeply saturated green, and lakes and mountain scenery look crisp and clear in the fresh air. Since Tsuyu falls in the off-peak tourist season, popular spots tend to be far less crowded, allowing for a more relaxed experience. Accommodation and airfare also tend to be more affordable during this period, making it an appealing time to travel on a budget.
With a good rain jacket and comfortable walking shoes prepared in advance, you can enjoy a thoroughly rewarding trip to Japan even during the rainy season.
4. 4 Recommended Spots to Visit During Tsuyu
Even during Tsuyu, Japan has plenty of destinations where you can enjoy a comfortable and fulfilling trip. Since weather patterns vary by region, choosing your destination based on your priorities makes a big difference.
Here are four spots that offer a high level of satisfaction even when visited during the rainy season.
4-1. Hokkaido — Less Affected by Tsuyu Than Honshu
Hokkaido is well known as one of the regions in Japan least affected by Tsuyu. While much of Honshu becomes hot and humid in June, Hokkaido enjoys dry air and average temperatures of around 20–22°C (68–72°F) — making for very pleasant conditions.
The island’s vast natural landscapes are ideal for outdoor activities such as hiking, cycling, and nature walks through national parks. In particular, the areas of Furano and Biei are stunning in early summer, with flower fields and rolling green hills in full bloom. Pre-summer vacation also means a wider selection of accommodation and a generally less crowded atmosphere.
For travelers who want to avoid the Tsuyu rains and enjoy a comfortable trip, Hokkaido is an exceptionally attractive destination.
4-2. Kamakura — Famous for Its Hydrangeas
Located in Kanagawa Prefecture, Kamakura is renowned as one of Japan’s premier spots for viewing hydrangeas (ajisai) during the Tsuyu season. Temples such as Hase-dera and Meigetsu-in are adorned with colorful hydrangeas lining their grounds and approach paths, their hues made all the more vivid by the rain. The historic city takes on a quiet, atmospheric quality in the damp air — quite different from its appearance on a sunny day, and deeply evocative of traditional Japan.
Kamakura is also a compact city, making it easy to duck into a cafe or museum if the rain picks up unexpectedly. Visiting early in the morning is a good way to beat the crowds and enjoy the seasonal flowers and historic streets in peace. This is a highly recommended destination for those who want to experience Japan’s most iconic rainy-season scenery.
4-3. Hakone — Where Hot Springs Make Rainy Days a Pleasure
Hakone is a well-rounded destination that combines hot springs (onsen), natural scenery, and cultural attractions, making it an excellent choice for a Tsuyu trip. On a rainy day, you can unwind at a traditional hot spring inn (onsen ryokan), soaking in an open-air bath (rotenburo) or a large indoor communal bath (daiyokujo) at your leisure.
The surrounding area is dotted with weather-independent attractions, including glass art museums and sculpture parks. Along the Hakone Tozan Railway line, hydrangeas bloom during Tsuyu, offering lovely seasonal views from the train windows. On clearer days, the area around Lake Ashi and various observation points may offer views of Mt. Fuji.
With easy access from major urban centers, Hakone is well suited for a day trip or an overnight stay, and it is easy to make the most of your time there regardless of the weather.
4-4. Tokyo — Packed with Indoor Activities
Tokyo is one of the easiest cities to enjoy during Tsuyu. The city is home to an enormous variety of indoor attractions, including major shopping complexes, museums, observation decks, and immersive themed experiences. The extensive subway and rail network makes it simple to travel between attractions without getting caught in the rain.
Tokyo also offers a wealth of diverse experiences: shopping, food tours, facilities celebrating anime and pop culture, cooking classes, and much more. Since Tsuyu is a relatively quieter period for tourism, even popular neighborhoods tend to feel more relaxed and navigable. For travelers who prefer not to leave their plans at the mercy of the weather, Tokyo is an exceptionally convenient and rewarding destination.
Conclusion
Tsuyu is one of the seasons that best captures the character of Japan’s natural environment and climate. While rainy days increase, the season breathes life into plants and lends landscapes a lush, atmospheric beauty. The relative lack of crowds at tourist spots and the potential for lower travel costs are added benefits of visiting during this time.
By choosing a region less affected by Tsuyu — such as Hokkaido — or building your itinerary around hot spring resorts and indoor attractions in urban areas, you can enjoy a trip that is not overly dependent on good weather. Check the latest forecasts before you go, pack a rain jacket and sturdy walking shoes, and your Tsuyu trip to Japan can be every bit as comfortable and memorable as any other time of year. Take the time to understand what makes this season special, and plan a travel style that suits you best.
*This article is based on information available as of March 2026.
