Nagano Weather in June

Nagano in June

Season: Summer
In Brief: Cool & Humid, with Rainfall of Late June

The climate in Nagano in June is mildly cool, with occasional showers towards the end of the month. It's the perfect time for a leisurely walk through dense forests with ice cream or an exhilarating camping trip in the mountains.

Temperature

Avg. Temperature Range: 14~23℃/57~74℉

Nagano's June offers comfortably cool days, rarely exceeding 30℃ (86℉), with early mornings and midnights bringing a slight chill. Increasing showers in late June can drop temperatures to around 24℃ (75.2℉), and the post-rain humidity adds to the refreshing ambiance.

Precipitation

Rainfall: 109 mm

Avg. Rainy Days: 11

Nagano boasts sunny and cloudy weather in June, ideal for outdoor activities. But beware, after June 25th, the plum rain season starts with 2-3 rainy days in the city and nearly daily showers in the mountains, though they usually last less than 1.5 hours.

Sunrise & Sunset

In June, Nagano boasts about 13 hours of daylight, from 4:28-4:31 to 19:00-19:10, perfect for outdoor activities like climbing Mount Togakushi and hiking in Karuizawa. On clear nights, stars shine brightly in the sky after 7 PM.

June Packing List in Nagano

Upper Body

Pick breathable short T-shirts and long dresses, a light jacket for morning warmth and midday sun protection, and warmer options like denim, outdoor, or fleece jackets for cooler mountain areas.

Bottoms

Casual slacks or jeans are suitable for the entire month, with short pants best reserved for sunny days.

Shoes

Opt for walking-friendly shoes like sneakers or canvas shoes, and avoid sandals unless you're indoors.

Accessories

Don't forget sunscreen, hats, and sunglasses to shield yourself from the intense midday sun.

Rain Gear (Especially Late June)

Don't forget a foldable umbrella or raincoat for the unexpected showers in late June.

Seasonal Tip: Camping Items (Early to Mid-June)

For camping lovers, embrace the coolness by bringing tents, foldable tables and chairs, and sleeping bags, or renting them on-site. Also, pack mosquito repellent to avoid bites and a telescope for stargazing.

Top Things to Do in Nagano in June 

Experience the Firefly Festival at Tatsuno Hotarudoyo Park (Early~Mid-June, 2025)

In June, as night falls, 20,000 fireflies light up the sky in a breathtaking display of fluorescent green, making you feel like you're stargazing in space at Tatsuno Hotarudoyo Park. They usually light up after 7:30 PM, peaking at 8:30 PM. Before entering the park, you can try local delicacies at the various festival stalls.

Note: Stay quiet to avoid disturbing the fireflies, and remember, flashlights are prohibited as they can cause them to stop illuminating.

Go on a Relaxing Vacation in Karuizawa

Hike in Karuizawa

In June, Karuizawa becomes a holiday haven with cool temperatures, fresh oxygen, and charming architecture. On clear days, hike Mount Asama, an active volcano, to discover unique volcanic rocks and enjoy a panoramic view of Karuizawa from the temple atop.

For an unforgettable experience, rent an onsen villa in the woods or a room with an onsen if your budget permits. On rainy days, cozy up in your shelter, light an oil lamp, soak in the hot spring, and enjoy the soothing rain tapping on the window. It doesn't get more relaxing than this.

Hike & Camp in Togakushi

Hike among Togakushi Cedar Forests

Along the Inner Togakushi Promenade, centuries-old cedar trees thrive in June's sun and rain, offering hikers shade under their vibrant green canopy. The serene path to Okusha, the main shrine, is filled with buzzing bees and birdsong. On rainy days, the antique shrines transform into a mystical, mist-covered fairyland.

On a sunny June day, Togakushi Campsite in Nagano beckons, a well-equipped and popular spot. Here, by clear streams on the expansive grassland, enjoy a family cookout. At night, lie back and gaze at the gem-blue sky above, filled with countless dazzling stars.

Nagano Travel Tips in June

1. For safety in natural areas like Karuizawa and Kamikochi, travel in groups and bring a bear bell to deter wild bears, especially at night. 

2. Check weather forecasts and attraction announcements before heading out, as heavy rain in late June can hinder hiking in mountainous regions.

3. Stay hydrated by bringing water or purchasing it at hiking attractions; ice cream is a refreshing treat, but enjoy it in moderation for health.