Osaka Weather in September

Season: Early Autumn
In Short: Hot in early September, gradually cools down, typhoon season

Although it is the early autumn in Osaka, the weather is still as hot as summer in early September. Entering mid and late month, the weather gradually cools down and the temperature difference in a day becomes large. During this time, a thin coat is necessary if your trip is mainly in the morning or evening. An important point to take note is that September is the peak season of typhoon. Traveling in this month in 2025, you need to pay attention to weather changes and avoid traveling in typhoon days.

Temperature

The average temperature in this month is 25°C (77°F). At the beginning of September, the temperature still maintains high like in summer. After entering the mid-month, the temperature gradually falls down. The difference between daytime temperature and nighttime temperature becomes large in this month.
Average High Temperature: 29°C / 84.2°F
Average Low Temperature: 23°C / 73.4°F

Rainfall

Because it is in the peak season of typhoon, the average rainfall in this month is 156mm, which is pretty high. The humidity is 62% and people feel comfortable with it. Although it only has 9 rainy days in this month, they are mostly heavy rains so it is not advisable to traveling in the rainy days.
Average Rainy Days: 9 days
Average Humidity: 62%

Sunrise & Sunset

September is the Autumnal Equinox time so the duration of daytime and nighttime tend to be the same. The sun rises at 05:41 and after about12.3h daylight hours, the sun sets at 18:05. The sunshine hours are around 5.1h, mainly in the afternoon. After having lunch, you can choose to go out and enjoy the sunshine.
Daylight hours: about 12.3h
Sunshine hours: around 5.1h

Recommended Clothes to Wear in September

The recommended clothes are divided into two parts. Part one is for early September and part two is for mid and late September. Part one mainly includes short-sleeve clothes and shorts. Part two includes one more long-sleeve coat and silk scarf.

Girls

Tops: In most of the time, summer clothes are suitable to the weather in September so blouse and T-shirt can be prepared in your luggage. In case of the sudden temperature drop or the strong wind, a trench coat is needed to prevent getting cold.
Bottoms & shoes: Jeans and thin sweatpants are suitable to the weather. You can match them up with a pair of causal shoes.

Boys

Tops: A short shirt is perfect for the weather in early September. In mid and late month, boys can choose to wear the short shirt with a thin jacket outside or only wear a simple hoodie. Both of these two choices are good.
Bottoms & shoes: Jeans and light pants are both advisable to wear. For boys, a pair of hiking shoes are highly recommended.

Accessories: For people who are afraid of the coldness, a silk scarf can help keep you warm.

Top Places to Visit in Osaka in September

Travel Recommendation:

1. Suito Kurawanka Fireworks Festival

If you miss the fireworks shows in summer, there’s another big fireworks show waiting for you in September. In the mid-month, the Hirakata Venue and Takatsuki Venue hold Suito Kurawanka Fireworks Festival. The total number of the fireworks is related to the number of local newborns in this year so this fireworks festival also has the meaning of continuing the filial line. Besides the fireworks show, it also has music festival. In Suito Kurawanka Fireworks Festival, visitors can experience two kinds of festive atmosphere at the same time.

2. Hirakata Park

In addition to watching fireworks, here’s another place for visitors, especially who travel with kids, the Hirakata Park. It is said to be the oldest amusement park in Japan but the equipment and facilities are updated constantly. It has about 40 types of facilities which are suitable for the whole family to enjoy. Besides the amusement rides, it also has zoo and garden. In Hirakata Park, visitors can enjoy the parent-child time without queuing for a long time.

3. Osaka Castle Main Tower (Osaka Castle Museum)

Osaka Castle is known as one of the three most famous castles in Japan. The main tower of Osaka Castle is also considered as the symbol of Osaka. It has 5 floors and is 55 meters (180.5 feet) high from the ground, which is pretty majestic. Inside the tower is a history museum which introduces the history of Osaka Castle through a wealth of treasures and other precious cultural properties. Visitors who are interested in Osaka history can’t miss this chance to learn it more specifically.

Osaka Castle Main Tower in September

4. Kishiwada Danjiri Festival

Kishiwada Danjiri Festival is the largest and most luxurious danjiri festival in Japan, held in mid-September each year in Kishiwada Castle. Danjiri is a huge handmade wooden car which weighs 4 tons. During this festival, more than 500 people carry the huge danjiri and rush in the narrow streets. The whole atmosphere is pretty exciting and visitors can be astonished by their passion. In addition, the detailed decoration of the danjiri is also worth appreciating. The whole danjiri is carved with historical figures, horses and other animals. What’s more, the danjiri is decorated with more than 200 lanterns. Especially in the evening, visitors can appreciate the lantern lighting activity and the whole danjiri can provide visitors a totally different visual experience. If you travel in this area in mid-September, don’t miss this marvelous festival.

September Weather for Other Cities in Japan:

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