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The climate in Japan

Average daytime and nighttime temperatures

All climate diagrams on this page result from the collected data of 61 weather stations.
Weather stations at an altitude above 610m have not been included.
All data correspond to the average monthly values of the last 20 years.
Back to overview: Japan
Climate zone: The northern part of Japan is located in the temperate climatic zone, while the southern part is subtropical.
A beach holiday can be enjoyed in the warmer season with water temperatures up to 25 degrees. The warmest and at the same time rainiest region is Kyūshū. The coldest is Hokkaidō. Due to the warmer temperatures the best time for traveling is from June to September. Less attractive are the cold months from November to March.
Duration of daylight and sunshine in Japan
Compare climate with other regions or countries
Hours of sunshine per daySunshine hours per day in Japan
Rainy days per monthRainy days per month in Japan
Precipitation in mm/dayPrecipitation in Japan
Water temperatureWater temperatures in Japan
Relative humidity in %Relative humidity in Japan
Absolute humidity in g/m³Absolute humidity in Japan

Regions in Japan

All figures per year. For detailed climate data click on the name of the region.
RegionTemperature
max Ø day
Temperature
min Ø night
Sunshine
hours
Rainy
days
Precipitation
Chūbu19.6 °C11.7 °C1,971 h125 1,818 l
Chūgoku20.8 °C12.4 °C1,971 h118 1,734 l
Hokkaidō11.3 °C4.2 °C1,716 h131 1,121 l
Kantō19.7 °C12.0 °C2,044 h110 1,799 l
Kinki20.7 °C12.6 °C2,008 h119 1,862 l
Kyūshū23.1 °C16.5 °C1,862 h119 2,113 l
Shikoku21.2 °C13.2 °C2,117 h102 1,770 l
Tōhoku16.2 °C8.0 °C1,716 h137 1,402 l

Temperature records of the last 149 years

The hottest temperature measured from 1873 to September 2022 was reported by the Nagoya weather station. In August 2018 the record temperature of 40.3 °C was reported here. The hottest summer from July to September, based on all 62 weather stations in Japan below 610 metres altitude, was recorded in 2010 with an average temperature of 25.7 °C. This average temperature will normally be measured every 4 to 6 hours, thus also including the nights. Normally, this value is 23.7 degrees Celsius. The average maximum daily temperature at that time was 29.6 °C.
The coldest day in these 149 years was reported by the weather station Asahikawa. Here the temperature dropped to -25.7 °C in January 2008. Asahikawa lies at an altitude of 140 meters above sea level. The coldest winter (January to March) was in 1875 with an average temperature of -0.7 °C. In Japan, it is usual to have about 5.8 degrees more at 5.1 °C for this three-month period.
The most precipitation fell in August 2014. With 50.4 mm per day, the Kochi weather station recorded the highest monthly average of the last 149 years. Incidentally, the region with the most rainfall for the whole year is around Owase. The driest region is near Abashiri.

Long-term development of temperatures from 1922 - 2021

In contrast to single record values, a long-term development cannot simply be brought about by all weather stations in the country. Both the number and the locations are constantly changing. A simply calculated average value would give a falsified result. If several measuring stations in particularly cold mountain or coastal regions are added in one year, the average would already decrease as a result of this alone. If a station fails during the summer or winter months, it does not provide any values and falsifies the average again. The subsequent long-term development was therefore reduced to only 24 measuring points in order to have actually comparable data over as long a period as possible.
In the years 1922 to 2021 there were only these 24 weather stations in the whole country, which reported continuous temperature values. From these weather reports we have created a long-term development that shows the monthly average temperatures. The hottest month in this entire period was August 2010 with 27.1 °C. January 1922 was the coldest month with an average temperature of -0.5 °C.
The average annual temperature was about 12.6 °C in the years after 1922 and about 14.7 °C in the last years before 2021. So in less than 100 years it has increased by about 2.0 °C. This trend only applies to the selected 24 weather stations in Japan. A considerably more comprehensive evaluation of the global warming has been provided separately.
Long-term development of temperatures in Japan

Data basis and methodology

The data of the individual measuring stations are based on the archives of the German Weather Service, individual values averaged and supplemented by own elements. In order to determine a representative national average, average values were first calculated for each part of the country, which were then summarized at the national level. Thus, if a disproportionate number of weather stations are located in a small area, their number does not affect the national average.
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