When Do Japan's Beaches Open in 2026? Swimming Season Dates by Region
When Do Japan's Beaches Open in 2026? Swimming Season Dates by Region
Most Japanese beaches are only open for swimming during a fixed season. A beach holds an "umibiraki" (海開き), the official opening, then staffs the sand with lifeguards or safety supervisors, sets up showers and changing rooms, and posts swimming hours. Outside that window there are no lifeguards, the facilities are shut, and at some beaches swimming is discouraged or banned.
On the mainland the season is short, usually a few weeks from July into late August. In Okinawa and the southern islands it is much longer, running from spring into autumn. This guide lists the 2026 swimming season for every beach on Japan Voyage, grouped by region.
Important: beach opening dates and hours change every year, and they can shift further because of weather (including typhoons), water quality, jellyfish, or construction work. Treat the dates below as a planning guide and always confirm on the beach's official site before you travel.
2026 Season at a Glance
- Suma Beach (Kobe, Hyogo): 9 July to 23 August 2026
- Ohama Beach (Sumoto, Awaji): 10 July to 31 August 2026
- Nushima Beach (Awaji): 18 July to 18 August 2026
- Ama Beach (Minamiawaji, Awaji): not yet announced; usually early July to late August
- Keino Matsubara Beach (Awaji): not yet announced; usually early July to late August
- Shirahama Beach (Wakayama): 3 May to 13 September 2026
- Jodogahama Beach (Miyako, Iwate): 4 July to 30 August 2026
- Ishigaki Island (Okinawa): opened 14 March 2026, season into late October
- Kerama Islands / Zamami (Okinawa): opened 18 April 2026, season into late autumn
- Miyako-jima (Okinawa): opened from 21 March 2026, season into November
- Katsurahama Beach (Kochi): no swimming season, swimming is prohibited year-round
Kansai: Awaji Island, Kobe and Wakayama
Suma Beach (Kobe)
Suma is central Kobe's main city beach, a short walk from JR Suma Station and certified with a Blue Flag for water quality and safety. The 2026 supervised season runs 9 July to 23 August, a 46-day period, with swimming hours 9:30 to 17:00. A jellyfish-net "Smile Beach" area is set up in front of the station, and there are showers, lockers and beach houses.
Ohama Beach (Sumoto, Awaji Island)
Ohama is a 750-metre crescent of white sand backed by pines, a short walk from central Sumoto and named one of Japan's 100 best beaches by the Ministry of the Environment. The 2026 season runs 10 July to 31 August, with swimming hours 8:30 to 17:00. Parking is free outside summer but 1,000 yen per visit during the season; barbecues, camping, fireworks and jet skis are prohibited.
Nushima Beach (Nushima Island, Minamiawaji)
Nushima is a small fishing island off the southern tip of Awaji, reached by a 10-minute ferry from Doshima Port. Its quiet swimming beach has a short 2026 season, 18 July to 18 August, with hours 9:30 to 15:00. Changing rooms and cold-water showers are free. Note that part of the swimming area is restricted in 2026 because of nearby construction work, so confirm the situation with Minamiawaji City before you go.
Ama Beach (Aman Kaigan, Minamiawaji)
Ama Beach sits at the southern tip of Awaji and has an almost tropical feel, with palm groves, mural art and AA-grade clear water; on early-summer nights the shallows sometimes glow with sea-fireflies. The 2026 dates had not been announced as of June 2026. The season usually runs from early July to late August (the 2025 season ran 5 July to 25 August), with supervisors on duty 9:00 to 17:00. Admission and parking are free. Awaji Island has no railway, so most visitors arrive by car.
Keino Matsubara Beach (Minamiawaji, Awaji Island)
Keino Matsubara is a 2.5-kilometre white-sand beach backed by a black-pine grove on Awaji's west coast, a National Scenic Spot famous for sunsets. The 2026 dates were not yet posted as of June 2026; the season usually runs early July to late August (the 2025 season ran 5 July to 24 August), with hours 9:00 to 17:00.
Shirahama Beach (Shirarahama, Wakayama)
Nanki-Shirahama has one of the longest mainland seasons in Japan thanks to its mild climate and bright imported white sand. The 2026 season runs 3 May (Golden Week) to 13 September, with swimming hours 9:00 to 17:00.
Tohoku: Iwate
Jodogahama Beach (Miyako, Iwate)
Jodogahama is a sheltered cove of white rock and clear water on the Sanriku coast. The 2026 season runs 4 July to 30 August, hours 8:30 to 17:00, but supervision is staggered: weekends and holidays only from 4 to 17 July, daily from 18 July to 16 August, then weekends and holidays only from 17 to 30 August. Outside the supervised days, showers and most restrooms are closed.
Okinawa and the Southern Islands
Okinawa's beaches open far earlier and stay open far longer than the mainland, often from March or April into late autumn. These are island groups with many separate beaches, so there is no single island-wide opening or closing date; the dates below are the headline umibiraki ceremonies. Box jellyfish (habu-kurage) are common from roughly June to September, so choose net-protected beaches in summer.
Ishigaki Island
Ishigaki holds one of Japan's earliest beach openings. The 2026 island umibiraki was held on 14 March, and swimming generally runs into late October, with the best conditions from late May to mid-October.
Kerama Islands (Zamami and Tokashiki)
The Kerama Islands are known for "Kerama Blue" water. Zamami Village held its 2026 umibiraki on 18 April at Ama Beach on Zamami, and supervised swimming on the main beaches such as Furuzamami runs through autumn. Tokashiki's per-beach dates and lifeguard days vary, so confirm with each village before visiting.
Miyako-jima
Miyako opens earliest of all. Shigira Beach held its 2026 opening on 21 March, among the earliest in Japan, and the main municipal Miyakojima Umibiraki took place on 5 April at Yonaha Maehama Beach. Swimming generally continues into November. Lifeguard hours are set per beach and per day depending on the weather.
Beaches Where Swimming Is Not Allowed
Katsurahama Beach (Kochi)
Katsurahama is one of Shikoku's most famous scenic beaches, tied to the samurai Sakamoto Ryoma, but swimming is prohibited year-round. Strong currents and unpredictable waves have caused drownings, and a permanent warning has been in place since 1965. There is no umibiraki and no lifeguards. Enjoy it as a sightseeing spot from the viewpoints rather than a swimming beach.
Before You Go
Dates and hours on this page reflect what each beach had announced as of June 2026. They change from year to year, and a beach can close early or restrict its swimming area at short notice for weather (including typhoons), water quality, jellyfish or construction. Always check the beach’s official site before you make the trip.
FAQ
When do beaches open in Japan?
Most mainland beaches open in early July and close in late August. A few, like Shirahama in Wakayama, open as early as May. Okinawa's beaches open from March or April and stay open into late autumn.
Can you swim at a Japanese beach before it officially opens?
You physically can, but there are no lifeguards, the showers and changing rooms are closed, and some beaches actively discourage it. Swimming during the supervised season is much safer.
Why do Okinawa beaches open so much earlier?
Okinawa's subtropical climate keeps the water warm enough to swim from spring. Islands like Miyako and Ishigaki open in March, months ahead of the mainland.
Are there jellyfish at Japanese beaches?
On the mainland, jellyfish become more common from mid-August, which is part of why the season ends then. In Okinawa, box jellyfish appear roughly June to September, so swim at beaches with protective nets in summer.
Do these 2026 dates apply every year?
No. Each beach sets new dates and hours every year, and they can change for weather or other reasons. Use this guide for planning and confirm on the official site before you travel.