Tsuyu: Japan's Rainy Season and the Hydrangea Temples Worth the Rain

Every year, a few weeks after the cherry blossoms and the Golden Week holidays, the sky over most of Japan turns soft and gray. Rain falls in steady, patient drizzles, the air grows warm and humid, and stone paths shine. This is tsuyu, Japan's rainy season, and while it is not the most popular time for sightseeing, it is also the season when hydrangea gardens reach their peak.

This guide explains what tsuyu is, how it got its name, when it arrives in different regions, and how to travel comfortably through it. It also introduces two of the best-known hydrangea temples, Meigetsuin and Hase-dera in Kamakura, and offers practical advice for packing, planning and enjoying the season.

What Is Tsuyu

Tsuyu (also pronounced baiu) is the rainy period that sweeps across most of Japan between spring and summer. It is caused by a stationary weather front that sits over the country, bringing weeks of cloud and recurring rain. It is not a single downpour but a pattern: some days are drizzly all day, others bring heavy showers, and a few are surprisingly bright.

It is sometimes called Japan's fifth season, and it has a practical purpose. The rain fills the rice paddies, helps crops grow, and supplies water for the rest of the year. The season is also separate from typhoon season, which comes later in summer and autumn, although the two can occasionally overlap. A typical tsuyu season lasts about six weeks in any one region, but it varies a great deal from year to year: it may pass quietly in one year and be extremely wet in another.

Why It Is Called Plum Rain

The kanji (Chinese characters) for tsuyu mean "plum rain." The term comes from China, where the same characters are read meiyu, and it refers to rain in the fourth and fifth months of the old lunar calendar. One traditional explanation is that this was the time when plums ripen in the regions south of the Yangtze River. Japan borrowed the characters while keeping its own pronunciations, tsuyu and baiu.

Japanese also has older and poetic names for the season. One is samidare, which can be translated roughly as "fifth-month rain" and appears often in classical poems, including haiku. The season word is a staple of the seasonal vocabulary that Japanese writers use. A light rain, an umbrella, and a droplet on a leaf are all familiar images in the arts of this time of year.

When Tsuyu Arrives Across Japan

Dates differ by region, and the following are typical ranges. Okinawa sees its rainy season earliest, from about early May to the second half of June. Southern Kyushu begins around the end of May, northern Kyushu and Shikoku in early June, and the Kansai region (Kyoto and Osaka) from about June 7 to around July 21. The Kanto region, which includes Tokyo, usually runs from about June 8 to around July 21.

Hokkaido is the notable exception. The front usually weakens before reaching the northern island, so there is no pronounced rainy season. That is why summer visitors who want to avoid the wet weather often head there. Japan's weather agency announces the start and end of tsuyu for each region, though these are usually described as approximate and may be revised afterward. Check a Japanese weather forecast for the current year before you plan.

Hydrangeas: The Flower of the Season

Hydrangea, called ajisai in Japanese, is the signature flower of tsuyu. Its round clusters of small blossoms look their best in the damp, soft light, and the colors range from blue to purple, pink and white. Color depends partly on the soil: acidic soil tends to produce blue flowers and alkaline soil tends toward pink. Temples and shrines across the country plant them in large numbers, and they are often called ajisai-dera, hydrangea temples.

The flowers usually peak from early to late June, with the exact timing depending on the region and weather. Many gardens are at their prettiest on a cloudy or lightly rainy day, when the colors look saturated and the leaves glisten. That makes the rainy season a surprisingly rewarding time for photographers.

Meigetsuin: The Temple of Hydrangeas

Meigetsuin in Kita-Kamakura is probably the most famous hydrangea temple in Japan. It belongs to the Rinzai Zen school (Kenchoji branch) and was founded by Uesugi Norikata, whose posthumous name gave the temple its title. Over 2,500 hydrangea bushes line the stone paths leading to the main hall, and more than 95 percent of them are a variety called hime ajisai, which turns a deep blue often called Meigetsuin blue.

The main hall has a famous window called Satori no Mado, the Window of Enlightenment, which frames the garden behind it like a living painting. The temple is a ten-minute walk from Kita-Kamakura Station. It becomes extremely crowded in June, so arriving shortly after opening on a weekday is the usual advice. Admission and opening hours change, so check the temple's official site.

Hase-dera and the Hydrangea Path

Hase-dera in Kamakura sits halfway up a hillside overlooking Yuigahama beach. The temple is known for its large wooden statue of the eleven-headed Kannon, which stands about 9.2 meters tall, and according to the temple's legend it washed ashore in 736. In June, a terraced Hydrangea Path climbs the slope with more than 2,500 plants in over 40 varieties, and visitors can look out over the sea between the blossoms.

The path is a narrow one-way loop with many steps, and the temple manages crowds with timed tickets, so expect a wait at peak times. The temple is about five minutes on foot from Hase Station on the Enoden line. It makes sense to combine it with the Great Buddha nearby, and to pair it with Meigetsuin on the same day by taking the JR line between Kita-Kamakura and Kamakura. From Tokyo Station, the JR Yokosuka Line reaches Kita-Kamakura in roughly an hour.

More Hydrangea Spots Near Tokyo

Kamakura is not the only choice. Takahata Fudoson Kongoji, a temple in Hino on the western side of Tokyo, is well known for its hydrangeas, and it can be reached by train from central Tokyo. Farther out, Ohirasan Shrine in Tochigi Prefecture and Hattori Farm Hydrangea House in Mobara, Chiba, are also popular in the season. Many other temples and parks across the country hold hydrangea festivals, often with small food stalls and special stamps.

If you are traveling in Kyoto, the Kansai region or Kyushu, local tourism sites list hydrangea gardens and their bloom status. The best approach is to check the temple's own page, since many post daily updates about how far the flowers have opened. Because tsuyu arrives earlier in the south and later in the north, you can sometimes follow the bloom if your trip is flexible.

How to Travel in Tsuyu

Tsuyu is manageable with the right preparation. Carry a compact umbrella at all times, since forecasts can change quickly, and wear shoes that dry fast. A light rain jacket is useful for temple walks, and quick-dry clothing helps in the humidity. Convenience stores sell inexpensive clear umbrellas almost everywhere, a good backup if you forget yours.

Plan flexible schedules and keep indoor options ready: museums, department store food halls, aquariums, and hot spring towns such as Hakone. Some travelers enjoy the season for its low-season advantages, because transport and lodging are often less crowded than in spring or summer. Rain also brings out details that sunny weather hides, such as moss glowing on temple stones and rain chains (kusari-doi) carrying water from the roof. Look out for teru teru bozu, small paper charms that children hang in windows to wish for fair weather, and keep a waterproof bag for your phone and camera.