Osaka Weather in August

Season: Summer
In short:
1. The weather of Osaka is the hottest in August throughout the year, with each day experiencing high temperature.
2. Precipitation of the city is not high this month, but rainstorms may happen due to typhoons.
3. Summer vacation and the Obon Festival Holiday lead to large numbers of visitors, calling for early reservations.

Osaka Castle Park in Sunny August

Month with the Highest Temperature in a Year

Osaka in August experiences the hottest weather all year round, with the daily highest temperature over 30 degrees Celsius (86 degrees Fahrenheit) nearly every day. Specifically, the daily high is usually in a range between 30 and 36°C (86 and 97°F), which makes it hard to stay outdoors for quite a while, let alone taking a city walk or enjoying the streetscape slowly. In rare cases, the daily high falls to around 26 to 28°C (79 to 82°F) on cloudy or rainy days, and the weather becomes less hot.

The temperature decreases slightly after sunset, but it is still over 25°C (77°F), and you may even feel a little hot just after dinner.

Moderate Precipitation with Occasional Thunderstorms

In August, Osaka doesn’t get too much rainfall, which totals about 106 mm on average. The number of precipitation days is also relatively small: the city only experiences 6 rainy days on average in this month.

August is in the typhoon season of Osaka, during which typhoons can bring rainstorms and constant rainy days on occasion, so you’re suggested to always pay attention to the latest weather conditions so that you can deal with sudden weather changes and re-plan your itinerary.

Sticky Weather Caused by Humid Air

Sumiyoshi Taisha Shrine, Osaka

The humidity of Osaka in August is about 69% averagely, which is at a high level. In this month with many hot days, the high humidity makes the weather muggy and even more unbearably hot.

The Longest Sunshine Duration in a Year

Osaka has long daylight in August, though it is in a decreasing trend from about 14 to 13 hours from the beginning to the end of the month. The long length of a day and also not-so-much precipitation jointly cause long sunshine duration of the city, which lasts for about 7 hours each day on average. Moreover, the UV index of the city can be 10 the highest, indicating a high risk of sunburn during long exposure to the sun and making practicing comprehensive sun-protection on sunny days quite important. In addition, the long sunshine hours and strong UV rays, together with the high temperature, make it not so comfortable to stay outside for too long on sunny days, especially during the midday hours.

Is August a Good Month to Visit Osaka?

In consideration of weather conditions, comfort, costs, and crowds, August is not a good time to visit Osaka. Firstly, the climate of Osaka is generally muggy, which is not comfortable for people to enjoy a trip here. Besides, because of the summer vacation and the Obon Festival holiday from August 13 to 16, the number of visitors in Osaka is large, especially in the mid-10-day of the month. Accordingly, transport tickets are in great demand and hotel room prices see an increase, making the Osaka tour in August 2026 expensive and crowded as a result.

What to Wear in Osaka in August?

Note: In this month with many humid days, it’s advised to bring more sets of quick-dry and thin summer clothes, so that you can always wear comfortable clothes during your tour.

Clothes: Vests, short-sleeved shirts, shorts, skirts, and dresses are recommended to pack. For people who prefer physical sun protection, a cooling sun-protective jacket with a hat is suggested.

Shoes: Sandals are the best, and you can also bring breathable sneakers or flats for a possible hike in the mountain area.

Requisites: Sunglasses, sunblock, a handheld fan, and a foldable umbrella.

How to Have a Good Tour in Osaka in August

1. Avoid the Most Crowded Mid-August

In light of Japan’s Mountain Day on August 11 and Obon Festival Holiday from August 13 to 16, some Japanese people choose to take a few days off to have a 9-day-long holiday from August 8 to 16 to travel around the country. To gain a better sightseeing experience, it’s highly suggested to avoid this crowded period. But if you can only make your tour at this time, better to make bookings as early as possible.

Crowded Shinsaibashi Shopping Street

Popular Kani Douraku in Dotonbori

2. Properly Arrange Indoor and Outdoor Sightseeing

To ensure you feel more pleasant during sightseeing each day, it’s suggested to visit must-go outdoor attractions in the cooler morning and late afternoon, and go to indoor attractions with cooling facilities around noon. Or, you can just take this hottest period to have a rest in hotels or cafes. Plus, it’s better not to make a too tight itinerary in view of such a hot and humid climate.

For example, a relatively comfortable daily itinerary can be: visit Osaka Castle just after its opening time; go to Umeda Sky Building for a panoramic view of the city; visit Dotonbori / Kuromon Market to have lunch with Osaka delicacies; go back to hotel for a little nap; visit the Namba Yasaka Shrine in the late afternoon; and stroll around Tsutenkaku for the illuminated tower view and also delicious Skewers.

Namba Yasaka Shrine

Observatory of Umeda Sky Building

3. Take the Mountain Area into Consideration

To escape the summer heat, the Minoo Park north of downtown Osaka is a good place. Covered with dense maple trees, this park has a large area of shade and lush green views. Moreover, along the hiking track in the park, you’ll find an impressive cascading waterfall, which makes the surrounding environment fresh and cool.

4. Enjoy Some Night Tour Activities

To some extent, Osaka is much more attractive after sunset, especially in this month with high temperature and high humidity during the daytime. In the Dotonbori area, enormous neon lights make the riverside streets dynamic, and thousands of lanterns are hung on both sides this month, becoming an unmissable view during a cruise on the river. Shinsaibashi serves as a cool inner place for shopping if you are sensitive to heat.