Tokyo rainy season begins in June

GO TOKYO updated its June visitor guide on May 15, 2026, saying June in Tokyo marks the beginning of the rainy season and framing the wetter stretch as part of the city’s early-summer appeal. The official travel site said purple and blue hydrangeas blooming across Tokyo are among the month’s main visual markers. The guidance is aimed at travelers planning June itineraries, with advice on weather, seasonal flowers and events. The Japan Meteorological Agency’s climate material for the Kanto-Koshin region, which includes Tokyo, says the rainy season typically runs from early June to mid-July. ### When does Tokyo’s rainy season usually start? The Japan Meteorological Agency says the climatological onset of the rainy season in Kanto-Koshin is around June 7, with withdrawal around July 19. The agency describes the baiu, or rainy season, as a seasonal period with more rain and less sunshine than the surrounding weeks. GO TOKYO’s June guide uses simpler travel language, telling visitors that “June in Tokyo means the beginning” of the rainy season. That phrasing aligns with the meteorological agency’s long-term averages for the wider region rather than a single fixed start date for central Tokyo. JMA’s historical table shows the onset can shift materially from year to year. In Kanto-Koshin, the agency lists onset at around June 21 in 2024 and around May 22 in 2025, compared with the climatological average of around June 7. ### What did the Tokyo travel guide tell visitors to expect? GO TOKYO said June brings wetter conditions and presented that as a practical planning point for travelers choosing what to do in the city. The guide pairs weather advice with seasonal sightseeing suggestions rather than treating rain as a reason to avoid visiting. The June page says hydrangeas are a signature sight at that time of year, with purple and blue blooms appearing across the city. The guide also says Tokyo hosts indoor and outdoor events in June, giving travelers options even during rainy spells. The official tourism site updated the English-language page on May 15, 2026. A Japanese-language version published at the same time carries the same basic message: June is the start of the rainy season in Tokyo and hydrangeas are a defining feature of the month. ### Why are hydrangeas so closely tied to June in Tokyo? GO TOKYO’s June guide names hydrangeas as one of the month’s visual highlights because the flowers peak as the rainy season begins. The site points to the blooms as a recurring seasonal attraction for visitors moving around neighborhoods, parks and shrine grounds. Hakusan-jinja Shrine and Hakusan Park in Bunkyo are one of the best-known examples on the tourism site. GO TOKYO’s event listing for the Bunkyo Hydrangea Festival says more than 3,000 hydrangeas bloom there in early summer, brightening the city during Japan’s rainy season. That listing ties the flower displays directly to the season’s calendar. For travelers, the result is that one of Tokyo’s wettest periods also overlaps with one of its most recognizable early-summer flower displays. ### Does the rainy season mean constant rain every day? The Japan Meteorological Agency says the rainy season is a transition period and notes that the reported onset and end each reflect an average changeover of about five days. That means the season is not defined by uninterrupted daily rain. JMA’s climate page for Kanto-Koshin says the period from early June to the middle of July is the rainy season, but weather within that span can vary. GO TOKYO’s guide similarly tells visitors to expect wetter conditions in June while continuing to recommend sightseeing and events. For travelers, the practical message from both sources is to plan for rain without assuming all-day downpours throughout the month. The tourism guidance emphasizes flexible itineraries, while the meteorological agency provides the longer seasonal frame. ### Where can travelers check the official guidance? GO TOKYO’s official June page is live now in English and Japanese on the city’s tourism website, with weather notes, seasonal highlights and event suggestions for June 2026. The site’s separate event pages also list hydrangea-related attractions, including the Bunkyo Hydrangea Festival. The Japan Meteorological Agency maintains the official climatological reference pages for baiu timing and the historical record for Kanto-Koshin onset and withdrawal dates. Travelers planning June visits can use GO TOKYO for itinerary ideas and JMA for the seasonal weather baseline. JMA’s 2026 rainy-season bulletin page is also available for in-season updates as conditions develop, while GO TOKYO’s June guide remains the city’s current official planning page for visitors. (gotokyo.org)