August is the hottest month in Osaka, with temperatures often exceeding 35°C (95°F). The coastal city's hot and humid summer air could leave you sweating even after a short walk.
While August features fireworks celebrations and festivals, consider them a bonus rather than a primary reason to visit, as they could be canceled due to bad weather.
If you prefer cooler weather and aren't keen on summer festivities, late September might be a better option for you.
Osaka's Weather and Climate in August
In August, Osaka experiences hot and humid weather, with average temperatures ranging from 24°C to 32°C (75–90°F) and occasional heavy showers.
Although it's in the middle of the typhoon season, Osaka is less affected due to its inland location. Typhoon paths can be forecasted, allowing you to enjoy your trip with the help of a professional travel consultant. Contact us at Asia Highlights for assistance.
Osaka August Weather Chart
This chart is based on data from 2024, and the 2025 data is expected to be similar.
Is August a Good Time to Visit Osaka?
Osaka Castle Park in SummerMany people avoid August in Osaka due to high temperatures and crowds, especially families with school-age children. June or late September would be a better option with cooler weather and fewer crowds.
If your travel dates are fixed, we recommend that you:
- Book at least 3 months in advance.
August is festival season, with events like Obon and the Naniwa Yodogawa Fireworks Festival, so secure your accommodation and flights early.
- Avoid midday sun (10 AM–3 PM).
Our Japanese travel advisor can create a schedule tailored to your interests, helping you avoid the heat and crowds. For example, visit outdoor sites like Osaka Castle and Nishinomaru Garden in the morning, then enjoy indoor activities or relax in your hotel during the hottest part of the day.
If your travel dates are flexible, consider visiting in spring (March to May) for cherry blossoms or autumn (September to November) for vibrant foliage.
Top Things to Do in Osaka in August
1. Admire Marine Life at the Osaka Aquarium Kaiyukan
Osaka Aquarium Kaiyukan, JapanThe Osaka Aquarium Kaiyukan is one of Japan's biggest, perfect for children who love sea creatures. You could buy them some souvenirs as mementos and some for their friends as gifts. With air-conditioning, you could comfortably explore the ocean tanks, making it feel like an underwater adventure.
2. Take a Boat Tour of Osaka Castle
Osaka Castle in SummerOsaka Castle is a must-see landmark for first-timers, but it could get crowded and muggy, especially in August. If the historical exhibition is not your favorite part, we suggest you skip the museum and take a boat tour around the moat to enjoy the breeze and view the castle from the water.
3. Experience Dotonbori's Vibrant Nightlife
Tombori river night cruiseIf daytime sightseeing is too hot, explore Dotonbori after sunset. The Dotonbori district is a haven for foodies and shoppers. What's more, you could opt for a 20-minute 'Tombori River Cruise' to relax and take in the scenery away from the crowds, especially when you are traveling with children and afraid of being separated by a crowd.
4. Attend the Naniwa Yodogawa Fireworks Festival
The Naniwa Yodogawa Fireworks Festival is held on the first Saturday of August every year, which in 2025 would be August 2nd, and offers a spectacular show along the Yodo River, which is a great chance to participate in the local festive event for tourists.
The event is free to attend, so you could expect a crowded night. It is better to arrive before 6 pm to secure a good spot. Keep in mind that outdoor events may be canceled due to the weather so treat this as a bonus activity.
What to Pack and Wear in Osaka in August
Before embarking on your adventure, you should prepare for the muggy weather in Osaka in August.
Japan's average temperature in 2024 is higher than the average temperature in the 30 years ending in 2020, exceeding the record set in 2023 and the highest since statistics began in 1989. With global warming on the rise, you should expect hotter weather for your trip in 2025.
Opt for breathable summer clothing, such as short-sleeved shirts, shorts, skirts, and sandals. Take insect repellent and anti-mosquito bracelets as mosquito activity peaks in summer.
You may enjoy getting a tan during your summer vacation but remember that strong UV rays could cause sunburn or even heatstroke, especially in children. Stay hydrated and pack sunscreen, a sun hat, and sunglasses. A parasol for both rain and sun is also a good idea since waiting in line under the scorching sunlight could be torture.
Let Us Help You Plan Your 2025 Japan Trip
Are you expecting to travel to Japan in the summer of 2025? See below for some of our most popular Japan tour itineraries:
Contact us and we'll help you to plan your Japan itinerary based on your personal preferences.
Osaka Weather by Month
Get Inspired with Some Popular Itineraries
At Asia Highlights, we create your kind of journey — your dates, your destinations, at your pace. You can have any trip tailor made for your travel.
