Just 35 minutes from Tokyo by Shinkansen, Atami Sun Beach is a 400-meter palm-lined seafront set beside one of Japan's most famous onsen towns. Swim or walk along the sand by day, watch the sunrise glow on Sagami Bay or the pink-purple sky before sunset; by night, the beach lights up every evening until 10 PM, all year round. This guide covers when to visit, how to plan a visit, and where Atami's other beaches fit in.The Beach in Four Lights — Morning, Afternoon, Sunset & NightThe same 400-meter beach takes on four different characters over the course of a day. The morning belongs to walkers and sunrise photographers; the afternoon to swimmers and families; the late afternoon to a pink-purple dusk over Sagami Bay; and the night to the moonlight-toned illumination that runs every evening, all year round.Morning Light: Sunrise over Sagami BaySun Beach faces east, so the sun rises directly over Sagami Bay and Hatsushima Island, a small inhabited island about 10 kilometers offshore. From mid-spring to early autumn, the sun comes up between roughly 4:30 and 6:00 AM; in winter, between 6:30 and 7:00. The promenade is almost empty at this hour, with a salt-edged sea breeze coming off the bay.Daytime Swim: Calm Waters, Family-FriendlyThe bay is sheltered by breakwaters, so during swimming season (July 11 – August 30, 2026) the waves stay gentle — small children play in ankle-deep water within a few steps of the shore. Outside the swimming season, visitors can still enjoy walks and sea views, but swimming is not allowed.Pink-Purple Dusk: The Late-Afternoon SkyIn the hour before sunset, the sky over the bay shifts through pink and purple, with the silhouette of Hatsushima cutting a low line across the horizon. The beach faces east, so sunset happens behind you over the hills, but the colors reflect across the water — often a favorite hour to photograph the beach itself.After Dark: A Moonlight-Themed IlluminationAfter dark, the beach turns into one of Japan's first beach illuminations — designed in 2004 by Motoko Ishii, an internationally recognized lighting designer also known for the nighttime lighting of Tokyo Station and the Yokohama Bay Bridge. The lighting runs every evening from sunset to 10:00 PM, year-round (briefly turned off during fireworks shows). The blue-green palette is themed on moonlight on water, which is why local visitors sometimes call the spot "Moonlight Beach." The illumination is free, and the promenade stays open to walk, sit, or photograph — ideal for couples and evening photography after dinner in town.Swimming Season and Summer ProgramsFrom July 11 to August 30, 2026, Sun Beach opens for swimming between 9:00 AM and 4:00 PM, with a seasonal waterpark, a kids' zone, and lifeguards on duty. Outside these hours and dates, the sand remains free to walk but swimming is not allowed.Season ItemWindowNotesSwimming hours9:00 AM – 4:00 PMJuly 11 – August 30, 2026; check the official Atami News page for current-year datesLifeguards on duty9:00 AM – 4:00 PMSwimming outside these hours is not recommendedWaterparkJuly 11 – August 30, 2026Open daily during the swim season; check the same official page for the start date each yearKids' zone (a designated section)Throughout the swim seasonNo alcohol or visible tattoos within this zone; anyone who follows these is welcomeRentalsDaily during swim seasonBeach beds, parasols, sun-shade tents, and floats — first-come, no reservationsMost of Sun Beach is open to everyone. Only the kids' zone — a designated section, not the whole shoreline — asks visitors to keep alcohol and visible tattoos out, a rule common at Japanese family beaches and onsen facilities; anyone who follows these rules is welcome there too. See the official Atami News page for the current area. The waterpark is a floating obstacle course set offshore in summer, and the same beach is one of the main viewing areas for the Atami Fireworks Festival — see the dedicated guide for the year-round schedule, fireworks-day train access tips, and viewing-spot comparisons.On non-festival summer evenings, you may also see families lighting small handheld sparklers on the sand after the swim zone closes. Only quiet, handheld sparklers are allowed — no launched or noise-making fireworks — and visitors are asked to take all their trash home. The sparklers are sold at local shops in town.Walks, Photo Spots & Stories Along the ShoreBeyond the swim season, the 400-meter promenade is what brings residents and visitors back day after day — a flat, palm-lined walk with three landmarks worth knowing, all reachable in a single 25-30 minute stroll.The 400-Meter Palm PromenadeThe walkway runs the full length of the beach, planted with palms and a paved promenade that locals call a "tropical feel" you don't expect 35 minutes from Tokyo. The sand itself is brought in from Kimitsu in Chiba Prefecture — Sun Beach is an engineered beach, originally completed in 1986 and extended to its current 400 meters in 1988. The whole stretch is flat and step-free, so it doubles as an accessible viewpoint of Sagami Bay.The Kan'ichi and Omiya Statue & the Omiya Pine (A Literary Seaside Landmark)At the western end of the beach, about 40 meters from the Ocean Deck (a raised pedestrian deck along the shore), a bronze statue of a man and woman in period dress stands beside a large pine known as the Omiya Pine — together, one of Atami's best-loved literary landmarks. The statue depicts a scene from Konjiki Yasha (The Golden Demon), one of the most celebrated novels of Japan's Meiji era (around the turn of the 20th century), a famous tale of love set partly on this very shore. The romance it represents has been part of Atami's identity for over a century, and the pine beside it takes its name from the story's heroine. The bronze statue was placed here in 1985.Jacaranda PromenadeJust beside the western end of Sun Beach runs a separate 340-meter promenade lined with jacaranda trees, gifted by Cascais, Portugal — Atami's sister city — in 1990 and developed into a promenade with 107 trees by 2014, said to be one of Japan's largest urban jacaranda plantings. The trees typically bloom in June, when the path becomes a tunnel of purple flowers; ATAMI Jacaranda Festival usually takes place in early-to-mid June, when the promenade is also lit up in the evenings — see the official Atami News page for the current-year schedule. For more on Atami's gardens and outdoor flowers across the seasons, see ACAO Forest, a 200,000-square-meter hillside garden 10 minutes by car from the beach.Other Atami Beaches — When to Go WhereSun Beach is Atami's central public beach, but the coastline also includes two smaller beaches with different characters. Both require a short train ride from Atami Station.BeachFrom Atami StationSuits visitors whoSwimming SeasonKey Practical NoteAtami Sun Beach15–20 min walk, or 5 min bus + 3 min walkWant to walk from central Atami; see the year-round evening illumination; watch the fireworksJul 11 – Aug 30, 2026Crowded in summer; nightly free illumination sunset–10 PM, year-roundNagahama Beach10 min train (Izutaga Sta.) + 8 min walk; ~10 min by carAre traveling with young children; arriving by car; want hot showers, beach huts, and rentalsJul 11 – Aug 30, 2026Hot showers, beach huts, and rentals operate during the swim season only; 400-car parking lotAjiro Onsen Beach15 min train (Ajiro Sta.) + 5–10 min walkWant unusually clear water; are combining a beach visit with an onsen ryokan stayJul 11 – Aug 30, 2026No parking lot, no coin lockers, no beach huts — best reached by train or as an onsen ryokan guestAll three are summer swimming beaches, but only Sun Beach is open — and illuminated — year-round. If you head to Ajiro, bring water and a towel: there are no shops or lockers on site. All three beaches' 2026 swim season runs July 11 to August 30; check each beach's official page before you go for the current year's dates.Getting Here and Practical NotesThe beach itself is free year-round, as is the nightly illumination. Below are the practical details — getting here, parking, on-site facilities, and where to stay.From TokyoThe Shinkansen reaches Atami from Tokyo Station in about 35 minutes by Hikari (or 29 minutes from Shinagawa), or about 45 minutes by Kodama, the more frequent service running every 30 minutes. For full route options, see the Tokyo to Atami access guide.From Atami Station to the BeachFrom the station, the beach is downhill — a 15–20 minute walk along the main shopping street (about 850 meters; the official guidance is "about 20 minutes" which includes a margin for the gentle uphill on the return). For a faster option, take a route bus from stop No. 7 at the Atami Station Bus Terminal to the "Sun Beach" stop — about 5 minutes — then walk 3 minutes to the shore (see the Atami Station bus stop guide for the route map). Taxis are also waiting at the station for around ¥1,000.%3Ccenter%3E%0A%3Ciframe%20src%3D%22https%3A%2F%2Fwww.google.com%2Fmaps%2Fembed%3Fpb%3D!1m14!1m8!1m3!1d6528.695299540192!2d139.07670800000002!3d35.098029!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0x6019bf2da754df55%253A0x1e064360cec6807c!2sAtami%2520Sun%2520Beach!5e0!3m2!1sen!2sjp!4v1748854618314!5m2!1sen!2sjp%22%20width%3D%22800%22%20height%3D%22400%22%20style%3D%22border%3A0%3B%22%20allowfullscreen%3D%22%22%20loading%3D%22lazy%22%20referrerpolicy%3D%22no-referrer-when-downgrade%22%3E%3C%2Fiframe%3E%0A%3C%2Fcenter%3EParkingAdjacent municipal Higashi parking lot, 250 spaces, ¥110 per 30 minutes.On-Site FacilitiesItemDetailsShowers6 outdoor cold-water showers, freeChanging roomsWomen-only changing rooms under the Ocean Deck, 8:30 AM – 5:45 PMCoin lockersSmall ¥300 (200 lockers) / Large ¥500 (40 lockers), 8:30 AM – 5:45 PMToiletsAccessible toilets with baby-changing tablesVending machinesOn siteRentals (swim season)Beach beds, parasols, sun-shade tents, floats — first-comeSmokingThe beach is non-smoking except in designated areasQuiet Hours & Beach MannersFor the quietest experience, visit before 9:00 AM in summer, or any weekday outside the swim season. To help keep the beach clean and beautiful for everyone, please take any trash home with you. The off-season (especially September through early June) is when the beach is at its calmest.Stay OvernightMany of Atami's onsen ryokan are within a 10-minute walk of Sun Beach. Staying overnight means you can soak in a hot-spring bath and then walk to the shore for the evening illumination. See Atami's onsen ryokan and hotels for options near the beach.FAQQ1. When can you swim at Atami Sun Beach?Atami Sun Beach is open for swimming from July 11 to August 30, 2026, between 9:00 AM and 4:00 PM, with lifeguards on duty during these hours. Swimming outside these dates and times is not recommended. For the current year's exact dates, check the official Atami News page.Q2. Is the beach accessible at night? When does the illumination run?Yes — the beach and promenade stay open at night, and the illumination runs every evening from sunset until 10:00 PM, year-round. Access is free. The lighting briefly turns off during fireworks shows. The blue-green moonlight palette is themed on light on water, which is why the spot is sometimes called "Moonlight Beach."Q3. How do I get to Atami Sun Beach from Tokyo?Take the Shinkansen from Tokyo Station to Atami — about 35 minutes by Hikari (29 minutes from Shinagawa), or about 45 minutes by Kodama, the more frequent service running every 30 minutes. From Atami Station, the beach is a 15–20 minute walk downhill (about 850 meters), or a 5-minute bus ride plus a 3-minute walk. For full route options, see the Tokyo to Atami access guide.Q4. Can I see the Atami fireworks from Sun Beach?Yes — Sun Beach is one of the main viewing areas for the Atami Fireworks Festival, which is held about 15 times a year from spring through autumn. For the annual schedule, fireworks-day train access tips, and a comparison of viewing spots, see the dedicated Atami Fireworks Festival guide.Q5. How does Sun Beach compare to other Atami beaches?Sun Beach is Atami's central beach, walkable from the station, with year-round nightly illumination and fireworks viewing. Nagahama Beach (10 min by train, then walk) suits families with young children and visitors arriving by car. Ajiro Onsen Beach (15 min by train) has crystal-clear water and pairs with a nearby onsen ryokan stay, though it has no parking, lockers, or beach huts.