Outdoor onsen (rotenburo) in Tokyo

Higashikurume · A 2026 reviewer mentioned being unable to use any of the outdoor baths due to crowding, confirming outdoor baths exist.

Hachioji · Reviewers describe an outdoor bath area that can become very crowded, especially in the evening with groups of young visitors.

Itabashi City · The facility has an outdoor bath area in the garden with natural hot spring water, including small pot baths and lying baths.

Taito City · Several reviewers from 2026 describe an outdoor bath (rotenburo) as part of the facility.

Inagi · Visitors in 2026-07 and 2026-08 described an outdoor bath area used for cooling down after bathing.

Akiruno · An outdoor bath is present alongside the indoor bath at the facility.

Shinjuku City · Multiple 2026 reviews describe an outdoor bath area with hot-spring and carbonated tubs and outdoor seating.

Taito City · Reviewers from 2026 describe an outdoor bath area separate from the indoor tubs.

Hachioji · Reviewers describe an outdoor bath area with several tubs, though the exact count reported varies.

Nerima City · Reviewers described an outdoor bath overlooking a Japanese garden.

Akishima · Multiple reviewers describe an outdoor bath, though one in 2026 found it too lukewarm.

Kunitachi · Visitors from 2026-06 to 2026-09 describe an open-air outdoor bath, sometimes with a Mount Fuji view.

Shinagawa City · Two outdoor baths are available, one for each spring water, though visitors note they get crowded.

Chofu · Visitors describe several outdoor bath types including cypress, cauldron-style, electric and rock baths.

Adachi City · Reviewers across 2026 consistently describe an outdoor bath area, though several note it uses heated tap water rather than spring water.

Sumida City · Visitors across 2026 repeatedly praised the outdoor bath area, which also has skytree views.

Kodaira · A 2026-06 review described spending evenings in the outdoor bath as excellent.

Hinode · There is an outdoor bath, described across several years as small but relaxing with natural sounds.

Machida · Visitors described the open-air bath as spacious and refreshing.

Machida · Multiple visitors between 2026-06 and 2026-09 described an outdoor bath with hot, lukewarm and cool pools set among trees.

Toshima City · The facility has outdoor baths including a natural hot spring tub and a silky/carbonated bath.

Edogawa City · Visitors described multiple outdoor baths, including carbonated and lying-down types, as spacious and enjoyable.

Suginami City · There is an outdoor natural hot-spring bath, but its city location means the view is unremarkable and one visitor found the men's outdoor bath's water circulation not working.

Tama · Visitors described an outdoor bath area with rock baths, reclining baths and forest surroundings.

Sumida City · The facility has a semi-open-air bath, though one visitor felt the outdoor bathing was limited compared to other facilities.

Nerima City · Reviewers from June to August 2026 consistently describe a natural hot-spring outdoor bath.

Chofu · There is an outdoor bath area split into a few sections, described as enjoyable though sometimes crowded and occupied by groups.

Tama · Reviews mention an outdoor bath including a carbonated outdoor tub, though one 2026 review said the outdoor bath water looked cloudy.

Koto City · Visitors in 2026 described an outdoor bath alongside the indoor bath.

Okutama · Reviewers consistently describe a single, small outdoor bath surrounded by trees.

Sumida City · Several reviewers describe a semi-outdoor bath with a Tokyo Skytree view.

Shinagawa City · Multiple outdoor baths including a carbonated spring bath were reported in 2026.

Machida · Multiple outdoor baths exist, including a rooftop 'sky' bath with a view, reported consistently from 2026-05 to 2026-08.

Ome · Reviewers from 2026-06 to 2026-08 consistently praise the outdoor rotenburo baths, including a rooftop one.

Koto City · A rooftop open-air bath exists, though it was under renovation at one visit and described by another as lacking a real view.

Kodaira · Several reviewers from 2026-06 to 2026-09 describe a lukewarm outdoor bath, some noting temperatures around 35-38°C.

Adachi City · There is one roofed outdoor bath with an outdoor rest area with chairs, sometimes closed for construction.

Arakawa City · Visitors describe a small open-air (or semi-open-air) silky bath area.

Inagi · Multiple reviewers from 2023 and 2024 described spacious outdoor baths as a highlight.

Shinagawa City · An open-air black-water bath is available on an upper floor, though it was occasionally reported closed for repairs.

Setagaya City · Visitors described an outdoor bath and outdoor tsubo bath, though one found it felt enclosed.

Taito City · Reviewers from 2026 consistently describe a large outdoor bath with nano-fine-bubble water.

Suginami City · Multiple visitors describe outdoor rock baths, some with rotenburo views of surrounding trees, from 2026-04 to 2026-09.

八丈島 · The facility has an outdoor bath with ocean views, alongside an indoor bath.

Hinohara · Multiple visitors describe a small outdoor bath alongside a one-person kama-buro tub.

Ota City · The facility has a small semi-open-air bath filled with the black 'kuroyu' hot spring water.

Itabashi City · Multiple visitors described an outdoor rock bath and outdoor jacuzzi at the facility (2024).

Oshima · Reviewers consistently describe an outdoor bath with views of Mount Mihara, from 2026-01 to 2026-08.

Shinagawa City · Most visitors describe an open-air-style black spring bath, though one 2026-01 review says it is actually indoors despite appearing open-air.

Ota City · Multiple visitors from 2026-02 to 2026-08 described an outdoor bath filled with the facility's black hot-spring water.

Taito City · There is an outdoor bath, but multiple reviewers note it exists only on the men's side, not the women's side.

Musashimurayama · Visitors in 2023-2025 described an outdoor bath that was pleasant, though sometimes on the lukewarm side.

Taito City · Reviewers disagreed, with some describing a semi-outdoor jacuzzi tub and others saying there is no outdoor bath.

Koto City · Visitors reported an outdoor natural hot-spring bath in addition to several indoor baths.

Edogawa City · Reviewers consistently described an outdoor area with a black-water rock bath, cold bath, and hinoki tub.

Akishima · Visitors consistently describe an outdoor bath, though one reviewer noted insects in it during summer 2026.

Meguro City · There is a rooftop outdoor bath that alternates weekly between the men's and women's sides, near the elevated train tracks.

Shinjuku City · Most visitors in 2026 described an outdoor bath, though one reviewer noted its absence, possibly due to the alternating men's/women's schedule.

Inagi · Visitors consistently describe an outdoor bath with a panoramic city skyline view, 2026.

Suginami City · Visitors described a spacious outdoor bath area with carbonated spring and gaemon-style tubs between 2026-02 and 2026-06.

Arakawa City · An outdoor (rotenburo) bath area is present and described as spacious.

Fuchu · Most reviewers described an outdoor herbal bath, though one 2024-09 reviewer said there was no outdoor bath and another noted it was closed for construction.

Edogawa City · Visitors consistently mention an outdoor (semi-open) bath alongside the indoor baths.

Tachikawa · Multiple reviews from 2025-12 to 2026-08 describe an open-air bath with rock and ceramic-jar tubs.

Ota City · A rooftop or half-open-air black-water bath is available, though it may close in winter or on certain days.

Adachi City · An outdoor bath with rotating themed hot water and a deep chilled cold plunge is reported consistently from April to September 2026.

Koto City · Multiple reviewers from 2025 to 2026 describe a rooftop-style rotenburo (outdoor hot bath) alongside a cold plunge and outdoor rest area.

Nakano City · An outdoor bathing area with a small pool and rotenburo tub is consistently described across reviews from 2026-02 to 2026-09.

Shinagawa City · Many reviewers (2025-11 to 2026-05) describe an outdoor bath located on whichever floor is assigned to that gender each week, using natural hot-spring water.

Edogawa City · An outdoor bath on the first floor, reached by walking through the indoor tub, was reported across 2024 visits.

Nakano City · The men's side has an outdoor rock bath, but one 2026 review states the women's side has no outdoor bath.

Edogawa City · Multiple visitors described an open-air bath as one of the facility's highlights.

Shinagawa City · Multiple reviewers described an outdoor bath, including a distinctive cave-style rotenburo.

Shinagawa City · There is one outdoor bath, often described as a garden-facing carbonated-spring bath, on the men's side; the women's side outdoor bath is smaller and lacks the garden view.

Hachijo Town · An open-air rotenburo bath is present in addition to the indoor bath.

Suginami City · Nearly every review from 2025 to 2026 highlights an artificial-carbonated open-air bath as a main feature.

Shinjuku City · Reviewers from 2025 through 2026 consistently describe an outdoor (rotenburo) bath, often noted as hotter than the indoor tubs.

Hachioji · Reviewers from 2025-2026 describe a small rotating-theme outdoor bath.

Setagaya City · Reviewers from 2025-11 to 2026-03 describe a small roofed outdoor bath alongside an indoor bath.

Toshima City · An indoor open-air style bath (uchi-rotenburo) is part of the bathing area.

Hachioji · An outdoor bath area is present, though some reviewers note it is small and gets crowded.

Taito City · An outdoor or semi-outdoor bath is available only on the floor assigned by the daily men's/women's rotation, not on every visit.

Meguro City · An outdoor bath is present and mentioned repeatedly across 2025-2026 reviews.

Ota City · An outdoor bath (rotenburo) exists with a roof, described as ranging from warm to somewhat hot across reviews.

Shibuya · Reviewers from 2026-05 to 2026-07 describe a small outdoor herbal bath that changes daily.

Mitaka · Visitors consistently describe a spacious open-air bath with garden and pond features.

Shibuya · Multiple visitors from 2025 to 2026 described a small open-air bath, roughly 40-42°C.

Ota City · Reviewers consistently describe open-air baths on both floors of the building across 2025-2026.

Chofu · Multiple reviewers described a rooftop or upper-floor open-air bath reached via stairs.

Itabashi City · There is a semi-outdoor bath area including a walking pool, though the sky is not visible.

Nakano City · Multiple reviewers from 2026-03 to 2026-05 described a semi-enclosed outdoor bath area with outdoor seating.

Ota City · Reviewers described a small semi-outdoor black-water bath area, though the urban surroundings limit any sense of openness (2025-2026).

Nishitokyo · Numerous reviews (2025-2026) describe an outdoor bath, sometimes with rock or cypress tubs and garden/sky views.

Suginami City · Many visitors from 2025 to 2026 describe a small outdoor carbonated-spring bath.

Kita City · Reviewers from 2025 to 2026 consistently describe an outdoor bath with a carbonated (tansan) pool.

Edogawa City · Reviewers consistently describe an outdoor rock bath filled with the natural black-water spring, generally cooler than the indoor tub.

Nakano City · Reviewers from 2026 describe a small outdoor tub alongside the indoor baths.

Setagaya City · Visitors from 2025 to 2026 consistently describe a small outdoor bath at the facility.

Hachijo Town · The facility is a single open-air (rotenburo) bath set outdoors near a waterfall.

Toshima City · Multiple reviewers describe a spacious outdoor bath, sometimes styled with Roman-palace decor, present on the bathing floors.

Taito City · A small semi-outdoor herbal bath is available in addition to the indoor tubs, noted in reviews from late 2025 to mid-2026.

Shinjuku City · An outdoor bath area exists, sometimes used seasonally as a cool-water tub.

Nakano City · Visitors repeatedly describe a roofless outdoor bath, often filled with milky-white water, across 2025-2026 reviews.

Itabashi City · Multiple reviewers from 2025 to 2026 described an outdoor bath (rotenburo) alongside the indoor tubs.

Ota City · A small outdoor air-bathing area with a water-fall style bath (uchidase-yu) exists alongside the indoor baths.

Chofu · The facility has an outdoor rock-style bath, though one visitor noted it closes around 23:00 while the sauna stays open later.

Kita City · Some visitors describe two outdoor baths, while another review states there is no rotenburo and no outdoor air bathing, so reports conflict.

Kozushima Village · There is a large ocean-view outdoor bath requiring swimsuits, though sections are sometimes drained or closed for maintenance in winter/off-season.

Oshima · An outdoor bath with a view of Mount Mihara is repeatedly praised across 2025-2026 reviews.

Shinagawa City · An outdoor bath exists but is accessed only by crossing the changing room from the main indoor bath, with some visitors noting it can run lukewarm or cold.

Setagaya City · Numerous reviewers from 2025–2026 describe an open-air bath on the second floor or rooftop with sky view.

Kita City · Reviewers from 2025-2026 describe a semi-outdoor rock bath and medicinal bath area.

Setagaya City · Multiple reviewers from 2025-2026 describe using the outdoor bath, though some note it lacks an outdoor lounging area.

Koganei · Reviewers in 2026 described an outdoor bath located under the elevated train tracks, including a men's tsubo-yu pot bath.

Adachi City · Multiple reviewers from 2025 to 2026 describe an outdoor bath area, though one review noted the women's side lacked an outdoor bath.

Nerima City · Most reviewers describe a half-outdoor or outdoor bathing area with a hot tub and open-air seating, though one 2026-05 review said this area was removed during renovation.

Itabashi City · Visitors consistently describe an outdoor bath area including a rock bath and a medicinal herbal bath.

Suginami City · Multiple reviews from 2025 to 2026 describe an outdoor bath, sometimes a small rock-lined tub.

Nerima City · An outdoor bath area is consistently mentioned by visitors across 2025 and 2026.

Mitaka · The facility had a semi-outdoor bathing area with a rock bath and separate outdoor cold bath.

Shinjuku City · A semi-outdoor cave-like bath called 'Confucius bath' lets in outside air, mentioned across 2025-2026 reviews.

Kita City · A small open-air bath exists, described as compact but usable year-round.

Adachi City · Multiple visitors between 2025-07 and 2026-06 described a courtyard-style outdoor bath area.

Toshima City · Multiple visitors from 2024 to 2026 describe an outdoor bath, sometimes with a charcoal-infused rock-bath style, though the sky is not visible.

Oshima · The facility is described as an open-air bath directly facing the ocean.

Adachi City · Visitors across 2024-2026 consistently describe a rooftop or third-floor outdoor bath, sometimes called 'Tokiwasure no yu'.

Ota City · Visitors described an outdoor black-water (kuroyu) bath that becomes a cold plunge in summer months.

Ota City · There is an outdoor-style bath area, but reviewers note it is only partly open to the air (a skylight or slit in the roof) rather than fully outdoors.

Nishitokyo · There is one outdoor bath that alternates weekly between the men's and women's sides, so it is not always available on a given visit.

Ota City · One visitor described an open-air bath while another called the rock bath 'open-air style', so its true outdoor status is unclear.

Komae · Multiple reviewers across 2024–2026 describe an open-air (rotenburo) bath, sometimes with a herbal or medicinal soak.

Nerima City · The facility has open-air baths including a herbal (yakuto) bath and a cold plunge, consistently mentioned from 2025 through 2026.

Shibuya · Many reviewers describe an open-air rock bath with sky view as a highlight of this urban sento.

Nerima City · An outdoor bath, often kept lukewarm in summer, is consistently reported from 2024 through 2026.

Kita City · Reviewers consistently describe an open-air bath containing a radon-mineral stone.

Taito City · There is an outdoor or semi-outdoor rock bath using the natural hot-spring water.

Sumida City · Most visitors (2025) describe a semi-outdoor 'forest bath' room with mist, though one 2025 review lists no outdoor bath.

Nakano City · Many visitors from 2024 to 2026 describe a small open-air or half-open-air bath as part of the facility.

Shinagawa City · Multiple reviews describe a roofed, semi-open-air rock bath alongside the indoor baths.

Adachi City · Most visitors describe a rock outdoor bath with koi and a small waterfall, though one 2024-09 review reported no outdoor bath that day.

Higashikurume · A small outdoor bath exists but alternates with a mist sauna between the men's and women's sides on a weekly rotation, and has no view.

Shinjuku City · An indoor-style outdoor rock bath with medicinal water is available, but only on one side of the gender-alternating layout each day.

Higashiyamato · An outdoor bath with a painted Mt. Fuji mural is consistently mentioned across years.

Shinjuku City · Reviewers consistently describe a jetted outdoor bath, often hotter than the indoor tubs, from 2025 through 2026.

Nerima City · Many visitors described a small semi-outdoor (rotenburo-style) bath with a milky medicinal-bath appearance, though the sky is not visible.

Itabashi City · There is a small outdoor bath, though several reviewers note it is enclosed with only a narrow view of the sky (2024-2026).

Itabashi City · Many visitors from 2023 to 2026 describe a small outdoor bath as one of the highlights.

Komae · Reviews from 2025-2026 consistently describe an outdoor bath with a daily-changing medicinal water.

Adachi City · Almost every reviewer from 2024 to 2026 mentioned a small semi-outdoor bath in addition to the main indoor bath.

Chofu · Many visitors from 2024 to 2026 describe an outdoor bath (rotenburo), sometimes noted as lukewarm.

Higashiyamato · Reviewers consistently mention an outdoor bath, though access alternates between men's and women's sides depending on the day (2024-2026).

Itabashi City · Reviewers from 2024-2026 consistently describe an outdoor-style bath, though it is roofed with no view of the sky.

Edogawa City · Nearly every visitor from 2024-2026 highlighted a large open-air bath overlooked by the bathhouse's tall chimney.

Minato City · An outdoor bath exists but is only on one of the two alternating weekly bathing sides.

Setagaya City · An outdoor (rotenburo) bath is consistently reported as available.

Koto City · Many visitors from 2024 to 2026 describe an outdoor or semi-outdoor bath at the facility.

Arakawa City · Reviewers describe a semi-outdoor bath area with a rock bath and reclining bath, though it is built onto the building rather than open-air.

Shinjuku City · An outdoor bath exists, described in 2024 as lukewarm or occasionally turned cold during hot weather.

Hamura · The facility has an open-air outdoor bath in addition to the indoor bath.

Tachikawa · The bath has a semi-outdoor (han-rotenburo) bathing area, though it does not offer a scenic view.

Mitaka · A rock-built open-air bath is a consistently praised feature across many reviews from 2024 to 2026.

Katsushika City · An outdoor 'garden bath' area is present, though visitors note it is enclosed by surrounding houses with limited scenery.

Mitaka · One 2024 reviewer describes an outdoor bath as the highlight, though most other reviews do not mention one.

Hinohara · Reviewers in 2024 describe the bath as open to mountain scenery and birdsong, suggesting an open-air or view-facing setting.

Katsushika City · Multiple reviews from 2023-2025 describe an open-air bath with an open-sky ceiling and seating area.

Adachi City · A rock-lined rotenburo with a garden and pond is consistently praised across reviews from 2023 to 2025.

Kita City · Reviewers across 2024-2026 described a mild-temperature outdoor bath.

Kita City · The facility has a radium-spring outdoor bath reached by walking through the indoor bath area.

Niijima · The entire bath is an open-air natural rock pool on the coast, with no indoor bathing area.

Itabashi City · A small outdoor rock bath is present alongside the sauna and cold bath.

Kita City · Almost every review from 2023 to 2026 describes a small outdoor bath with cloudy, mineral-infused water styled like a hot spring.

Fuchu · Several reviewers (2022-2025) describe a semi-open-air rock bath, though one described it as not a true outdoor bath.

Koto City · Numerous reviewers from 2023 through 2026 describe a small open-air outdoor bath, sometimes located across a passage from the changing room.

Nishitokyo · Reviewers from 2023 to 2025 describe a spacious outdoor reclining bath, sometimes reported as quite hot.

Niijima · There is an outdoor bath with ocean views, noted repeatedly from 2025 into 2026.

Itabashi City · There is an 'open-air' bath, but multiple reviewers note it is largely enclosed with just a roof and openable windows rather than truly outdoor.

Adachi City · There is a small outdoor-style bath, though several reviewers noted it has a glass or acrylic roof rather than being truly open-air.

Chuo City · There is an outdoor-labeled bath area, though visitors note it offers little or no actual view of the sky.

Miyake · There is an outdoor bath in addition to the indoor bath, but reviewers from 2023-2024 note it is closed during winter months.

Arakawa City · Several reviewers mention a semi-outdoor bath and courtyard area, though one 2025 reviewer clarified it is only a small tub, not a true open-air garden bath.

Katsushika City · An open-air bath exists, but some visitors note that it (or its cold-water version) only operates on weekends.

Akishima · One 2025 review said there is no rotenburo while another 2025 review described a half-open-air changing bath.

Niijima · This is an outdoor, ocean-facing natural hot spring pool, not an indoor bath.

Taito City · The rooftop area has a cold water pool and outdoor cooling space, though another visitor noted the facility lacks a traditional outdoor hot bath.

Fuchu · An outdoor electric bath (denkiburo) was consistently mentioned from 2020 through the facility's closure in 2023.

Kita City · An outdoor bath with a waterfall shower (utaseyu) is repeatedly mentioned as a highlight from 2022 through 2026.

Nerima City · A 2022 review mentions a rock outdoor bath in addition to the indoor tubs.

Koto City · One 2025 review mentions an outdoor bath among the facility's tubs.

Katsushika City · Numerous reviews from 2021 to 2026 describe a small outdoor bath overlooking a garden.

Adachi City · One reviewer mentioned an outdoor bath, but no other review, including several detailed ones, confirms an outdoor bath exists.

Niijima · The bath consists entirely of open-air natural rock pools directly on the coastline.

Kita City · Visitors from 2019 to 2023 consistently describe an outdoor or semi-open-air bath as part of the facility.

Ota City · Several reviewers (2020-2025) describe a small outdoor bath, though most say it is only on the women's side.

Kozushima Village · Reviews from 2021 and 2017 describe an outdoor bath, some facing the ocean.

Ome · Newer reviews (2026) report a half-open-air bath alternating by gender side, though a 2024 review said there was no outdoor bath.

Niijima · The bath is a set of natural rock hollows on the shoreline that fill with hot spring water, visible mainly at low tide between 2022 and 2025.