[2026 Edition] Top 10 Summer Resorts in Japan | A Complete Guide to Cool Summer Spots with Temperature Guidelines

In mid-summer, temperatures exceeding 35°C are not uncommon in Tokyo and Osaka. However, Japan has many "summer resorts" where the maximum temperature remains around 25°C, and in some places even below 20°C. Some places are more than 10°C cooler than urban areas. This article introduces 10 spots to visit for those seeking coolness, categorized into two coolness levels, along with a guideline for summer temperatures based on the Japan Meteorological Agency's average values.

How different are summer temperatures compared to cities?

Let's compare the average maximum temperatures for July and August (these vary from year to year).

• Tokyo: Approx. 31°C / Osaka: Approx. 34°C / Kyoto: Approx. 34°C
• Karuizawa: Approx. 26°C / Kushiro: Approx. 21°C / Kamikochi: Approx. 23°C
• Tateyama/Murodo: Approx. 13-18°C — A world where you need a jacket even in midsummer.

Refreshing Summer Resort | Maximum Temperature 25-28°C

Comfortable enough to walk around in light clothing. A classic area that is easy to combine with sightseeing.

【Approx. 26°C】Karuizawa (Nagano)

A leading highland resort in Japan, continuing since the Meiji era. Enjoy a full day of fun in the cool air, strolling through Old Karuizawa Ginza, visiting churches in the forest, and cycling. Its easy accessibility—approximately one hour from Tokyo by Shinkansen—is also a major draw.

[Approx. 26°C] Hakodate (Hokkaido)

A northern port town with a pleasant sea breeze. Walk along the slopes of Goryokaku and Motomachi, enjoy a seafood bowl at the morning market, and in the evening, admire the million-dollar night view from Mount Hakodate. It's the perfect city for a summer introduction to Hokkaido.

[Approx. 25°C] Nasu Highlands (Tochigi)

One of the leading highland summer resorts in the Kanto region, home to an Imperial villa. Ranches, art museums, and hot springs are compactly located, making it ideal for family trips. A Tochigi tour combining it with a visit to the World Heritage Site, Nikko Toshogu Shrine, is also recommended.

[Approx. 25°C] Kusatsu Onsen (Gunma)

The hot spring town, at an altitude of approximately 1,200m, is refreshing even in summer. You can enjoy the steam from the Yubatake, the Yumomi show, and visiting the public baths—a luxurious stay where you can enjoy "hot springs x summer retreat" all at once.

[Approx. 26°C] Hakone/Sengokuhara (Kanagawa)

One of the closest summer retreats to Tokyo. The journey itself—transferring between the mountain railway, ropeway, and Lake Ashi sightseeing boat—is an attraction in itself. Don't forget to visit Hakone Shrine, with its vermilion torii gate standing on the lakeshore.

[Approx. 27°C] Oirase Stream (Aomori)

A gorge that seems made for walking, with waterfalls, moss, and clear streams continuing for approximately 14km. Thanks to the shade of the trees and the spray of water, the perceived temperature is even lower, making the forest bathing experience exceptionally refreshing.

[Approx. 28°C] Lake Kawaguchi (Yamanashi)

A resort with a spectacular view of Mt. Fuji reflected on the lake's surface. Enjoy cycling along the lakeside, the views from the ropeway, and the lavender fields in full bloom during the summer. A classic choice for those who want to enjoy a cool view of Mt. Fuji.

Cool Summer Resort | Maximum Temperature Below 25°C

More than just "cool," it's "chilly." Bring a jacket.

[Approximately 21°C] Kushiro/Akan-Mashu (Hokkaido)

With an average summer high temperature of approximately 21°C, it's one of the coolest major cities in Japan. Enjoy the cool air and magnificent nature of Lake Mashu (often shrouded in mist), Lake Akan (home to marimo algae), and the Kushiro Marsh.

[Approx. 23°C] Kamikochi (Nagano)

Located at an altitude of approximately 1,500m, Kamikochi is synonymous with mountain resorts overlooking the Hotaka Mountain Range. The view from Kappa Bridge over the Azusa River is the definitive summer mountain scenery of Japan. The inner shrine of Hotaka Shrine (/shrines/chubu) sits on the shore of Myojin Pond, where the mystical pond and shrine quietly welcome you.

[Approximately 13-18°C] Tateyama/Murodo (Toyama)

At an altitude of 2,450m, it's a different world where snowfields remain even in midsummer. Anyone can reach the coolness above the clouds via the Tateyama Kurobe Alpine Route, which involves taking cable cars and buses. It is also a mountain of faith, with the main shrine of Oyama Shrine located at the summit of Mt. Oyama.

Points on clothing and belongings

• Temperatures in the highlands and mountainous areas can drop below 15°C in the mornings and evenings. A light jacket is essential; for Murodo-level terrain, a windproof jacket is recommended.
• Layering is key: Adjust with a moisture-wicking base layer, a warm mid-layer, and a windproof/waterproof outer layer.
• Mountain weather changes rapidly. Lightweight rainwear is safer than a folding umbrella.
• Take insect repellent in streams and forests. Wear comfortable walking shoes.

Summary

From the port town of Hakodate to Murodo high in the clouds, Japan offers so many "cool" options during the summer. Summer resorts often coincide with summer festival season, so planning in conjunction with the Summer Festival Guide and Event Calendar allows you to enjoy both coolness and festivals.

Frequently Asked Questions

Are the temperatures in this article guaranteed?

No. The temperatures listed are estimates based on average values ​​and vary from year to year and day to day. In recent years, even summer resorts have experienced extremely hot days, so please check the latest weather forecast before departure.

Are summer resorts crowded?

Late July to mid-August is the peak season in Japan, coinciding with summer holidays and the Obon festival. To avoid crowds and accommodation costs, early July or late August onwards are ideal. For accommodations in popular areas, we recommend booking 1-2 months in advance.

Do I need a jacket even in mid-summer?

Yes, you do. Even though it's comfortable during the day, it gets chilly in the mornings and evenings. Especially at high altitudes like Kamikochi and Murodo, it's best to have long sleeves and a windproof jacket even in July and August.

Where do you recommend for a first-timer?

If you're starting from Tokyo, Karuizawa, Hakone, and Kawaguchiko are easily accessible and safe choices. If you want to cool off properly, try Kamikochi, or even venture to Tateyama and Murodo.