Japan’s summer is hot, humid, and packed with some of the country’s best festivals. Here is how to approach it intelligently.
Tokyo and Osaka regularly hit 35-37 degrees Celsius in July and August, with high humidity. And yet summer in Japan has experiences no other season replicates: taiko drumming at festival matsuri, fireworks over rivers, the cool relief of mountain air, and the extraordinary solitude of Hokkaido’s flower fields.
Quick answer: June is the best summer month pre-peak heat, lower crowds, more affordable. July and August are most festival-heavy but hottest and most expensive. Hokkaido runs 10 to 15 degrees cooler than Tokyo all summer.
Month by Month
June – Rainy Season and Hydrangea
Tsuyu is the rainy season with persistent grey skies and heavy intermittent rain. Crowds are significantly lower than in the spring, and hotel prices are reasonable. Hydrangea season: Meigetsuin Temple in Kamakura and hillsides around Kyoto turn vivid blue and purple in mid-June.
July and August – Peak Summer
Peak heat and peak festivals. Obon in mid-August brings the year’s largest domestic travel surge, with transport bookings out, and popular areas becoming very crowded. The compensation is the festival calendar: massive matsuri in every city, hanabi fireworks on most summer weekends, and the distinctly Japanese culture of yukata, shaved ice, and festival food.
Summer Festivals
Gion Matsuri – Kyoto (July)
One of Japan’s three great festivals. The main float parade is on July 17. The preceding evenings (July 14 to 16) feature outdoor stalls, and the city is at its most festive. Book Kyoto accommodation for Gion Matsuri 3-4 months in advance.
Sumida River Fireworks – Tokyo (late July)
Around 20,000 fireworks over 90 minutes, watched by up to a million people. Get there by 5 pm for a riverside spot.
Tenjin Matsuri – Osaka (July 24 to 25)
One of Japan’s three great festivals. Boat procession on the Okawa River, fireworks, and the full energy of Osaka festival culture.
Where to Go in Japan in Summer
Hokkaido – Escape the Heat
Furano and Biei lavender fields peak in mid-July. Summer hiking in Daisetsuzan National Park. Sapporo’s Beer Garden. 10 to 15 degrees cooler than coastal Japan. See the Hokkaido guide.
Japanese Alps – Mountain Hiking: The mountains in
Nagano and Gifu Prefectures are 10 to 15 degrees cooler than coastal cities. Kamikochi Alpine Valley, from July to September, offers some of Japan’s finest scenery.
Okinawa – Tropical Beach Season
Beach season runs from May through September, with outstanding coral reef snorkelling and diving. See the Okinawa guide.
Cities – How to Survive the Heat
Start days early (temples before 8 am are cool and quiet). Rest indoors from 12 pm to 4 pm in air-conditioned spaces. Resume outdoor activity in the late afternoon. Use the convenience store and constantly refer to the Japan convenience store guide.
Summer Food
- Kakigori: Finely shaved ice with flavoured syrup. The essential summer dessert, available from festival stalls and specialist shops.
- Hiyashi chuka: Cold ramen with soy-vinegar dressing. Summer-only menu item at most ramen shops.
- Unagi: Grilled eel over rice, traditionally eaten on Doyo-no-Ushi-no-Hi in late July. One of Japan’s great summer meals.
Practical Notes
- What to pack: Lightweight clothing, compact folding fan (500 to 1,000 yen in Japan), good sunscreen (buy Japanese sunscreen at any pharmacy), insect repellent.
- Typhoon season: August through October. Check forecasts have flexible bookings in late August and September.
- Obon 2026: August 13 to 16. Book transport and accommodation well in advance.
