Updated: November 07, 2018
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Weather In Japan In August. Temperatures, Precipitation & Humidity

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

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Weather In August

Temperature

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Because Japan is an island and has a climate that is greatly affected by the Pacific Ocean (warms up slower and cools off slower than continental climates), the hottest month of the year is August, as opposed to July for most parts of the planet that have continental climates.

In terms of average temperature, the average high is about 30 degrees Celsius (86 Fahrenheit) for most of Japan except for Hokkaido with an average August high in the mid-twenties (mid-seventies in Fahrenheit).

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

Sapporo, Hokkaido: 26.4 C (79.52 F)
Sendai, northern Honshu: 27.9 C (82.2 F)
Tokyo, central Honshu: 30.8 C (87.4 F)
Osaka, southern Honshu: 33.4 C (92.1 F)
Fukuoka, Kyushu: 32.1 C (89.8 F)
Naha, Okinawa: 31.5 C (88.7 F)

Interestingly, the hottest part of Japan in the summer is not Naha Okinawa, the capital city of the southernmost prefecture located near Taiwan, but the Kansai area in the southern part of Honshu where Osaka and Kyoto are located. The reason for this is that it is in a basin between mountains which traps hot air.

Rain & Humidity

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There is a rainy season in Japan that occurs for the southern three major islands (Honshu, Shikoku, Kyushu) that generally runs from mid-June to mid-July called Tsuyu. By August, Tsuyu has receded and on average there are more sunny days during the month of August than there are during the other summer months. The humidity is however high (over 70% on average for most of Japan) which results in the temperature feeling as much as 10 C (18 F) hotter than what it would feel like if it were a "dry heat". You'll often hear Japanese people say that the weather outside in the summer is "mushi atsui" 蒸し暑い, which is a word that is formed from the combination of the characters for steam 蒸し and hot 暑い.

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: 9.5
Sendai, northern Honshu: 12.2
Tokyo, central Honshu: 9.0
Osaka, southern Honshu: 7.6
Fukuoka, Kyushu: 10.4
Naha, Okinawa: 13.6

The Kansai region (Osaka) stands out again, this time for being the area with the less days with precipitation in August.

Bottom line, Japan is very hot and humid in August for the most part, except for Hokkaido which as a relatively more bearable summer climate with lower humidity and temperature.

Things to do in August

If the heat doesn't scare you, there are many good reasons to visit Japan during the month of August. One of them are the awesome, massive, impressive, amazing fireworks festivals that run through mid July to mid August.
There are also many kinds of traditional dance festival called obon matsuri, and August is a great season to go hiking in the Japanese Alps. It's also the perfect time of year to climb Mount Fuji.
tabikamome
Japanese food culture enthusiast. Love to explore new areas and discover local specialties.

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