Yuncheng is the southernmost prefecture-level city in Shanxi province, People's Republic of China. It borders Linfen and Jincheng municipalities to the north and east, and Henan and Shaanxi provinces to the south and west. At the 2010 census, its population was 5,134,779 inhabitants whom 680,036 lived in the built-up (or metro) area made of Yanhu District.
In early China, it was the location of the state of Kunwu (昆吾).
Yuncheng has a continental, monsoon-influenced semi-arid climate (Köppen BSk), with four distinct seasons. Due to its southerly location and position to the north of the Zhongtiao Mountains, allowing for downsloping when winds are from the south, it is among the warmest locales in the province. Winters are cold and very dry, while summers are hot and humid. Monthly mean temperatures range from −0.9 °C (30.4 °F) in January to 27.4 °C (81.3 °F) in July, and the annual mean is 14.05 °C (57.3 °F). Over 60% of the annual rainfall occurs from June to September. With monthly percent possible sunshine ranging from 45% in March to 54% in May and July, the city receives 2,219 hours of bright sunshine annually, low by Shanxi standards and north China.