Nagano Weather in August

Season: Midsummer
In Brief: Bearably Hot; Moderate Rainfall; Festive Month; Summer Resort

Despite being the hottest month, mountainous and river-rich landscape keeps temperatures pleasantly cool, making Nagano an ideal escape from the summer heat. Travelers can enjoy numerous summer festivals during this time.

Nagano Togakushi Shrine in August

Temperature

Avg. Temperature Range: 19~28℃/67~82℉

In August, Nagano's temperatures can hit 30°C (86°F) during the day, rarely exceeding 35°C (95°F), making the heat manageable. At night, they drop to a pleasant 15°C to 20°C (59°F to 68°F), ideal for outdoor activities. On the highlands, the climate stays cool all month, with early mornings and nights slightly chilly.

Precipitation

Rainfall: 98 mm

Avg. Rainy Days: 10

Nagano in August brings 8 to 10 rainy days downtown and about half the month of rain in the mountains. Showers and thunderstorms are frequent, with occasional long spells over 2 hours. Heavy downpours are uncommon, occurring just 2 to 4 times a month.

Sunrise & Sunset

In August, Nagano boasts 13 to 14 hours of daylight, where the sunrise ranging from 4:53~5:17 and the sunset from 18:17~18:53, perfect for a packed schedule. Sunny days allow for non-stop adventures from dawn to dusk.

Special this Month: Obon Festival & Fireworks Festivals

Obon Festival (Aug. 9~17, 2025)

Nagano Flavored Tempura

The Obon Festival is a significant traditional celebration in Japan honoring deceased family members. During Obon, tourists can witness yukata-clad dancers moving to taiko drum beats and Japanese women in kimonos releasing lit lanterns into rivers, symbolizing their ancestors' memories drifting with the currents. In Nagano, don't miss the local festive tempura set featuring shrimp, squid, eggplant, and pumpkin.  

During the 2025 Obon Festival, lasting up to nine days, Nagano will become a prime destination as the Japanese seek summer leisure. Booking accommodations in advance and planning your itinerary carefully will help you secure affordable rooms and avoid the inconveniences of long queues and heavy traffic.

Fireworks Festivals (Late July ~ August)

Nagano, Japan's top fireworks producer, hosts over 30 festivals, including smaller celebrations with hundreds of fireworks at the Hakuba Summer Festival and grand events showcasing thousands at the famous Suwa Lake Fireworks Festival. These vibrant displays make the perfect summer finale.

Packing List

Upper Body

A short-sleeved T-shirt paired with a sunscreen jacket suits well for this month. Pack thick outerwear for colder wild areas.

Bottoms

Both long and short light pants are suitable, but bring long, thick pants for colder mornings and nights in the mountains.

Shoes

Sneakers, sports shoes, or canvas shoes will be comfortable and convenient for walking.

Accessories

Pack sunscreen cream and hats for sunny days, and always remember to apply mosquito repellent before heading out. Bear bells may be less useful in late August due to the crowded wild attractions in Nagano.

Rain Gear

Bring umbrellas, raincoats, and rain boots for August outdoor activities. In case there is unexpected rain, you can purchase them on site.

Seasonal Tip: Fireworks Festival Wearing

Yukata, a traditional Japanese garment, is very popular for attending fireworks festivals, which adds a touch of elegance to both you and your photos.

Top Things to Do in August in Nagano

Enjoy Fireworks at the Suwa Lake Fireworks Festival

The annual Suwa Lake Fireworks Festival offers travelers an unforgettable experience with an impressive display of 40,000 fireworks launched from water pads, starting after 7 PM and lasting for two hours. The reflections on the lake's surface add to the magic, and the resonating sounds from the surrounding mountains make it even more special.

In 2025, the festival will take place on August 15.

Watch the Fireworks in Yukata

Dance in Matsumoto BONBON Festival

The BONBON Festival is a lively celebration that invites travelers to join in the fun and dance along to the original song "BONBON Matsumoto." The festival gathers about 300 dance groups competing to showcase their best performances at Matsumoto Castle. Visitors can witness locals dressed in striking red festival costumes and indulge in delicious local treats such as soba noodles and refreshing iced apple soda at the various stalls. 

In 2025, the festival will take place near August 2.

Matsumoto Castle in August

Nagano Travel Tips in August

1. During the Suwa Lake Fireworks Festival, the weather can be chilly windy by the lake, so it's advisable to bring a windproof jacket for comfort and warmth.

2. The viewing area at Suwa Lake Fireworks Festival is on wet grasslands, so waterproof pads are essential if you want to sit comfortably.

3. During persistent heavy rains in August, avoid outdoor activities in Nagano due to muddy paths, limited visibility, and heavy winds. Instead, unwind in a local onsen or explore museums for a more enjoyable and comfortable experience.