Japan Rainy Season Guide: What to Expect During Tsuyu

Tsuyu (梅雨, literally "plum rain") is Japan's annual rainy season, brought by a stationary front of warm, moist air from the Pacific. It typically begins in early June and ends in mid-to-late July, though timing varies by year and region.

Tsuyu does not mean constant torrential rain — it means more frequent rain, higher humidity, and overcast skies. Many days still have breaks of sunshine. Think of it as "rainy week" weather rather than monsoon season.

Regional timing:

• Kyushu/Shikoku: Early June (first to enter tsuyu)
• Osaka/Kyoto/Nara: Early-to-mid June
• Tokyo/Yokohama: Early-to-mid June
• Sendai (Tohoku): Mid-June
• Hokkaido: No official rainy season (the front usually doesn't reach this far north)

Okinawa's tsuyu (called "Uki" in Okinawan dialect) typically comes earlier — May to mid-June — and ends before mainland Japan's begins.

During tsuyu, Japan typically sees:

• Temperatures: Warm to hot — Tokyo averages 22–28°C (72–82°F) in June. The warmth combined with high humidity makes it feel hotter than the thermometer suggests.
• Humidity: High — 80–90% relative humidity is common. This is the most uncomfortable aspect of tsuyu for visitors from drier climates.
• Rain patterns: Heavy bursts (sometimes 50–100mm in a few hours), followed by breaks. Not steady drizzle all day. The JMA (Japan Meteorological Agency) weather forecast app gives hourly precipitation data.
• Risk: Flooding and landslides in mountainous areas during heavy rainfall events. Check JMA warnings before heading into mountains during tsuyu.

• Compact umbrella: Essential. A sturdy, compact umbrella fits in any bag. Convenience stores also sell cheap umbrellas (¥500–¥700) so you can buy one if caught in a sudden downpour.
• Light rain jacket: Packable rain jackets are more comfortable than umbrellas for active days (cycling, hiking, sightseeing). Keeps hands free.
• Moisture-wicking clothing: Fast-drying synthetic fabrics are far more comfortable than cotton in high humidity. Cotton stays wet all day.
• Waterproof sandals or shoes: Closed-toe waterproof shoes or sandals that dry quickly. Waterlogged sneakers are miserable in tsuyu.
• Dry bags / waterproof pouches: For electronics and documents.
• Cooling towel and portable fan (uchiwa): The humidity makes it feel hotter — these help significantly.

The rainy season has genuine advantages that travel media often overlooks:

• Lower crowds: Tsuyu is Japan's lowest tourism season. Famous sites are significantly less crowded. Queues at Kyoto temples, Tokyo attractions, and popular restaurants are shorter.
• Lower prices: Flights and hotels cost considerably less than cherry blossom or autumn foliage season.
• Hydrangeas (アジサイ / ajisai): Japan's most beautiful rainy-season bloom. Thousands of hydrangeas flower in deep blues, purples, and whites across garden shrines and hillside paths. Famous spots include Meigetsuin (Kamakura), Mimurotoji (Uji), and Hakone's ropeway.
• Lush greenery: After a dry spring, Japan's forests and temple gardens are their most vibrant and green in June.
• Less competition for popular experiences: Ryokan bookings, restaurant reservations, and tourist boat tours are all easier to secure.

• Depachika (department store basement food halls): An entire world of prepared foods, sweets, and seasonal specialties. Isetan Shinjuku, Takashimaya Osaka, and Daimaru Kyoto are excellent.
• Museums: Rainy days are ideal for Tokyo's National Museum (Ueno), teamLab digital art (Azabudai Hills), teamLab Borderless (Azabudai Hills), or Mori Art Museum (Roppongi Hills).
• Onsen and sento: Soaking in a hot spring on a rainy June day is a deeply pleasant Japanese experience.
• Ramen shops: June is perfect ramen weather — warming, aromatic broth while rain patters outside.
• Shopping: Covered shopping arcades (shotengai) and department stores in every city offer rainy-day retail therapy.
• Traditional crafts: Many Japanese craft studios offer half-day workshops (pottery, calligraphy, indigo dyeing) that are perfect for rainy afternoons.
• Manga cafes (漫画喫茶 / manga kissa): Small private booths with thousands of manga volumes, internet access, drinks, and sometimes shower facilities. ¥500–¥1,500/hour.

Best regions during rainy season:

• Hokkaido: The only major region without a rainy season. June and July are Hokkaido's most beautiful months — lavender fields in Furano, green mountains, and comfortable temperatures.
• Kamakura: June hydrangea season at Meigetsuin (the "hydrangea temple") transforms this seaside town into one of Japan's most beautiful rainy-season destinations.
• Hakone: The Hakone Tozan railway line during hydrangea season (late June) is one of Japan's most romantic train journeys.
• Kyushu: Tsuyu ends earlier in Kyushu — by late June, conditions often improve. Great time for hot spring towns like Beppu and Yufuin.

Regions to approach carefully: Mountain hiking routes and areas prone to flooding. Check JMA warnings before heading into the countryside during heavy rain periods.