is a city located in Kagoshima Prefecture, Japan. The modern city of Satsumasendai was established on October 12, 2004, from the merger of the city of Sendai, the towns of Hiwaki, Iriki, Kedōin and Tōgō, and the Koshikijima Islands (which consisted of the villages of Kamikoshiki, Kashima, Sato and Shimokoshiki, all from Satsuma District). As of May 2017, the city has an estimated population of 96,411 and a population density of 140 persons per km2. The total area is 683.50 km2. The city has regular Shinkansen services to Kagoshima City and Yatsushiro. The city is also home to Kagoshima Immaculate Heart University, founded in 1994, which has a small population of foreign students. A major employer is the Sendai nuclear power station. Geography Climate Satsumasendai has a humid subtropical climate (Köppen climate classification Cfa) with hot summers and mild winters. Precipitation is significant throughout the year, and is heavier in summer, especially the months of June and July. The average annual temperature in Satsumasendai is . The average annual rainfall is with June as the wettest month. The temperatures are highest on average in August, at around , and lowest in January, at around . Its record high is , reached on 19 August 2013, and its record low is , reached on 24 January 2016. Demographics Per Japanese census data, the population of Satsumasendai in 2020 is 92,403 people. Satsumasendai's population has been declining slowly since the census began in 1950, although there was a brief recovery in the 1980s. Timeline From 1889 to 2004 April 1, 1889 - municipal status enforcement. Satsuma District : the villages of Kumanojō, Takae, Nagatoshi, Hirasa, Kami-Tōgō, Shimo-Tōgō, Hiwaki and Iriki. Taki District : the villages of Taki and Mizuhiki. Minami-Isa District : the villages of Ōmura, Kuroki and Imuta. Koshikijima District : the villages of Kami-Koshiki Shimo-Koshiki. March 29, 1896 - The districts of Taki, Minami-Isa and Koshikijima were merged into Satsuma District. May 20, 1929 - The villages of Kumanojō, Hirasa and Higashi-Mizuhiki were merged to become town of Sendai. July 1, 1933 - The village of Nishimizuhiki was renamed to Mizuhiki. February 11, 1940 - the town of Sendai was elevated city status to become the city of Sendai. November 10, 1940 - The village of Hiwaki was elevated to town status to become the town of Hiwaki. October 1, 1948 - The village of Iriki was elevated to town