Rainy Season (梅雨, Tsuyu): A Guide to Weather, Culture, and Survival

Japan’s Rainy Season (梅雨, Tsuyu) is a unique period marked by persistent rain, high humidity, and overcast skies. While it may seem gloomy to some, this season has its own charm and plays a crucial role in Japan’s natural and cultural landscape.

When Does the Rainy Season Occur?

The Tsuyu period varies across Japan:

• Okinawa: Early May to mid-June (earliest start).

• Kyushu, Shikoku, and Southern Honshu (including Tokyo, Osaka, Kyoto): Early June to mid-July.

• Tohoku (Northern Japan): Late June to late July.

The Japan Meteorological Agency officially announces the start (Tsuyu-iri, 梅雨入り) and end (Tsuyu-ake, 梅雨明け) each year.

Why Does Tsuyu Happen?

The rainy season is caused by the Baiu Front (梅雨前線), a stationary weather front where warm, moist air from the Pacific clashes with cooler air from the north. This collision results in prolonged rainfall, sometimes leading to heavy downpours and even flooding in certain regions.

What to Expect During Tsuyu

1. Weather Conditions

• Frequent rain: Light drizzles to heavy storms.

• High humidity (80-90%): Makes the air feel sticky and uncomfortable.

• Milder temperatures (20–25°C / 68–77°F): Cooler than summer but very muggy.

2. Nature’s Beauty

• Hydrangeas (Ajisai, 紫陽花): Symbolic flowers of Tsuyu, blooming in vibrant shades of blue, purple, and pink. Popular viewing spots include Kamakura’s temples and Hakone’s gardens.

• Lush greenery: The rain revitalizes forests, making hiking trails exceptionally scenic.

How to Survive (and Enjoy) Tsuyu

Essential Gear

• Umbrella (preferably compact & sturdy): Strong winds can break flimsy ones.

• Waterproof shoes or boots: Avoid soggy socks!

• Quick-dry clothing: Light, breathable fabrics help with humidity.

Health Tips

• Stay hydrated—humidity can be deceptive!

• Use anti-mold sprays for closets and bathrooms.

• Carry a small towel to wipe off sweat in the muggy air.

The End of Tsuyu & Transition to Summer

By mid-to-late July, the rains taper off, marking Tsuyu-ake (梅雨明け). The weather quickly shifts to hot, humid summer, with temperatures soaring above 30°C (86°F).

stay safe!