Japan’s Rainy Season (Tsuyu)
Japan’s rainy season (tsuyu, or baiu) is one of the most misunderstood periods on the travel calendar. Travellers who avoid Japan during June and early July miss one of its most atmospheric seasons: hydrangeas in full bloom, atmospheric mist over mountain valleys, dramatically lower hotel prices, and significantly thinner crowds at popular attractions. Understanding what tsuyu actually involves helps visitors plan effectively.
When and Where Is the Rainy Season?
The rainy season front (baiu zensen) moves northward through Japan from late May to late July:
- Okinawa: mid-May to late June
- Kyushu, Shikoku, Chugoku: early to mid-June
- Kansai (Kyoto, Osaka) and Kanto (Tokyo): mid-June to mid-July
- Tohoku: late June to late July
- Hokkaido: does not experience a formal rainy season
Rain falls most days during tsuyu but not all day — mornings are often clearer, with heavier rain in the afternoons. The total daily rainfall is similar to other seasons; what changes is the persistence and humidity. Typhoon risk is low during tsuyu; the main typhoon season follows in August and September.
What Blooms During Rainy Season
Hydrangeas (Ajisai)
Hydrangeas are Japan’s rainy season flower. Temples and parks across the country plant thousands of bushes specifically for tsuyu viewing. Famous spots include Meigetsuin temple in Kamakura (nicknamed “hydrangea temple”), Mimurotoji temple in Uji (Kyoto), Hakusan Shrine in Tokyo’s Bunkyo district, and the hillside paths around Nagasaki. Peak bloom: mid-June, though earlier in Kyushu.
Iris (Shobu/Hanashobu)
Iris flowers peak in early to mid-June. Meiji Jingu Gyoen (the inner garden of Meiji Shrine in Tokyo) has one of Japan’s most celebrated iris gardens. Horikiri Shobu-en in eastern Tokyo displays over 6,000 plants.
Travel Advantages of Rainy Season
Accommodation prices drop noticeably during tsuyu compared to the peak seasons of cherry blossom and autumn foliage. Many ryokan and hotels offer low-season rates of 20 to 40% below peak pricing. Popular temples and gardens in Kyoto and Kamakura that become crowded shoulder-to-shoulder in spring are walkable and photographable during rainy season’s weekdays.
The atmospheric mist and overcast light of tsuyu are genuinely beautiful for photography and for experiencing Japan’s moss gardens, which are at their most vivid green. Saihoji (Kokedera, the moss temple) in Kyoto is best seen in early summer when rainfall keeps the moss lush. Shuzenji Onsen in Izu Peninsula takes on a romantic quality in fine rain.
What to Pack for Rainy Season
- A compact umbrella or lightweight waterproof jacket — Japan’s department stores and convenience stores sell affordable umbrellas everywhere if you forget
- Quick-dry clothing — humidity is high and cotton stays wet; synthetic and merino wool fabrics are more comfortable
- Waterproof shoes or sandals suitable for puddle-walking
- A small bag cover or dry bag for camera equipment and electronics
Practical Tips
- Check hourly weather forecasts rather than daily ones — morning windows of clearer weather are common
- Many temples and parks have excellent covered walkways and roofed corridors; plan for covered sightseeing options on heavy rain days
- Museum visits and indoor attractions are naturally well-suited to rainy days; book timed-entry in advance for popular exhibitions
- Japan’s umbrella etiquette: wet umbrellas go in stands at shop and museum entrances, never inside
Last checked: April 2026. Rainy season onset dates vary by year; check seasonal forecasts from late April.