Climate in Kantō

Average daytime and nighttime temperatures

All climatic diagrams on this site result from the collected data from six measuring weather stations in Kantō.
All data correspond to the average monthly values of the last 20 years.

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Kantō is one of the coldest regions in Japan with an average daily high temperature of only 20 degrees centigrade. A beach holiday can be enjoyed in the warmer season with water temperatures up to 24 degrees. Due to the warmer temperatures the best time for traveling is from July to September. Less attractive are the cold months from November to March.
Overview: Climate in Japan
Daylengths and sun positions in Japan
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Hours of sunshine per daySunshine hours per day in Kantō
The number of hours of sunshine refers to the time when the sun is actually visible. That is, without any obstruction of visibility by clouds, fog or mountains. With 7 hours per day, April is the sunniest month in the region of Kantō. In October the sun shines the shortest.
Rainy days per monthRainy days per month in Kantō
A rainy day is a day on which at least an amount of 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 12 rainy days, July offers the most number of rainy days, and in January the least.
Precipitation in mm/dayPrecipitation in Kantō
The amount of precipitation is measured in millimeters per square meter. Thus, at two mm/day, two liters of water fall on one square meter within 24 hours. With only 2.4 mm, the least rain falls in January. October, on the other hand, has the most rain.
Water temperatureWater temperatures in Kantō
Water temperature depends not only on solar radiation within the same region, but also on ocean currents. For example, depending on the season, cold or warm water masses are moved from other areas. The warmest temperatures in Kantō are in August, when the water is 24 °C.
Relative humidity in %Relative humidity in Kantō
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture of the physically possible is actually contained in the air. At high humidity, the person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% gives as pleasant. With humidity averaging 76%, July is the most uncomfortable. In January, on the other hand, it is easier to endure.
Absolute humidity in g/m³Absolute humidity in Kantō
In warm months, there is also a higher absolute humidity almost everywhere. At a temperature of 25°C, air can absorb up to 23 grams of water per cubic meter. At 20°C, it is only 17.3 grams. A relative humidity of 40% at 25°C thus corresponds to an absolute humidity of 9.2 grams of water. From a proportion of approx. 13.5 grams, humans perceive the air as muggy. This limit is reached in 4 months in Kantō, although these are average values, and a month is rarely completely or not at all considered humid.
Humidex in °CHumidex in Kantō
The "Humidex" (humidity index) is an index of well-being in warmer areas, calculated from the air temperature, relative humidity and dew point. The index corresponds approximately to the temperature felt. At high temperatures, the body transports heat away by sweating. At high humidity the ambient air can only absorb a small amount of sweat and thus one feels uncomfortable. An index of 20-29 is considered comfortable. Up to 39, people perceive the air as slightly uncomfortable, and above 40, as very uncomfortable. Values above 45 are dangerous in the long run and often lead to heat stroke.
Climate charts for other regions in Japan

Map of Kantō

Most important cities in the region »Kantō«

As the capital region, it is arguably the most important part of Japan. Alone 9 major cities with over 500,000 inhabitants are located here. The region has a west-east extension of about 180 km and over 220 km from north to south.

It consists of the seven prefectures Chiba, Gunma, Ibaraki, Kanagawa, Saitama, Tochigi and Tokyo.

CityPopulationGeo position
Tokyo13,960,23635° 41' 22"N139° 41' 30"E
Yokohama3,731,70635° 26' 52"N139° 38' 33"E
Kawasaki1,531,64635° 31' 14"N139° 43' 2"E
Saitama1,290,02935° 54' 29"N139° 39' 24"E
Chiba972,86135° 36' 17"N140° 7' 24"E
Funabashi622,89035° 41' 35"N139° 58' 60"E
Kawaguchi578,11235° 48' 19"N139° 42' 39"E
Hachioji577,51335° 39' 21"N139° 19' 26"E
Utsunomiya518,59436° 33' 57"N139° 53' 1"E
Matsudo483,48035° 46' 60"N139° 54' 0"E
Omiya456,27136° 32' 60"N140° 25' 0"E
Machida432,34835° 32' 25"N139° 27' 3"E
Fujisawa423,89435° 20' 31"N139° 28' 12"E
Kashiwa413,95435° 51' 16"N139° 58' 8"E
Yokosuka406,58635° 17' 1"N139° 40' 2"E
Takasaki370,88436° 19' 60"N139° 1' 0"E
Kawagoe350,74535° 54' 31"N139° 29' 7"E
Tokorozawa340,38635° 47' 57"N139° 28' 9"E
Koshigaya337,49835° 52' 60"N139° 46' 60"E
Maebashi336,15436° 23' 28"N139° 3' 39"E
Ichihara274,65635° 31' 0"N140° 4' 60"E
Mito270,78336° 20' 29"N140° 26' 48"E
Hiratsuka258,22735° 19' 23"N139° 20' 32"E
Soka247,03435° 49' 13"N139° 48' 16"E
Chigasaki239,34835° 19' 34"N139° 24' 14"E
Kasukabe232,70935° 58' 52"N139° 44' 39"E
Tsukuba226,96336° 12' 0"N140° 5' 60"E
Atsugi225,71435° 26' 20"N139° 21' 35"E
Minami-rinkan224,01535° 28' 60"N139° 26' 60"E
Ota219,80736° 17' 60"N139° 22' 0"E

Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants:, United Nations Statistics Division and own research.
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