Updated: July 11, 2018
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Weather In Japan In September. Temperatures, Precipitation & Humidity

Information about the weather in Japan in September. Included are average temperatures for major cities and the average number of days with precipitation.

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Weather In September


From the peak temperatures of August, average temperatures drop throughout Japan in September, which is generally considered to be the last month of summer.

As a reference, here is the average high temperature in September for some major cities in Japan from north to south.

Sapporo, Hokkaido: 22.4 C (72.3 F)
Sendai, northern Honshu: 24.4 C (75.9 F)
Tokyo, central Honshu: 26.9 C (80.4 F)
Osaka, southern Honshu: 29.3 C (84.7 F)
Fukuoka, Kyushu: 28.3 C (82.9 F)
Naha, Okinawa: 30.4 C (86.7 F)

The southern-most prefecture of Japan Okinawa, which has a tropical climate, is still hot, whereas the northern Island of Japan, Hokkaido, starts to be markedly cooler.

Rain & Humidity

September is the peak of the typhoon season in the Pacific Ocean. In Japan, typhoons hit the east coast of the country most frequently in the form of tropical storms or depressions that drop a lot of water in a relatively short time. So for many regions on the east side of Japan, including Tokyo, September is the month that has on average the most precipitation. It is a second rainy season of sorts.

As a reference, here are the average number of days with precipitation in August for some major cities in Japan from north to south.

Sapporo, Hokkaido: 11.1
Sendai, northern Honshu: 13.4
Tokyo, central Honshu: 12.2
Osaka, southern Honshu: 10.3
Fukuoka, Kyushu: 10.9
Naha, Okinawa: 12.5
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