Kōshi is located in a northern inland part of Kumamoto Prefecture. The northern part of the city is one of the prefecture's leading grain-producing areas, with soils consisting of
volcanic ash humus called "Kuroboku", which is the result of volcanic ash falling from
Mount Aso. Residential and commercial areas are located along national and prefectural roads and the Kumamoto Electric Railway. A new urban area has also formed in the southwestern area adjacent to Kumamoto City, and the population is on the rise as a
commuter town for Kumamoto City.
Neighboring municipalities Kumamoto Prefecture •
Kikuchi •
Kikuyō •
Kumamoto •
Ōzu Climate Kōshi has a
humid subtropical climate (Köppen
Cfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Kōshi is 15.3 °C. The average annual rainfall is 1988 mm with September as the wettest month. The temperatures are highest on average in August, at around 26.1 °C, and lowest in January, at around 4.6 °C.
Demographics Per Japanese census data, the population of Kōshi is as shown below ==History==