Nancheng (Chinese: 南城县; pinyin: Nánchéng; lit.

'south city') is a county of eastern Jiangxi province, People's Republic of China.

[2] Nancheng County has a humid subtropical climate (Köppen Cfa), with long, humid, very hot summers and cool and drier winters with occasional cold snaps.

The monthly 24-hour average temperature ranges from 6.0 °C (42.8 °F) in January to 29.1 °C (84.4 °F) in July, with an annual mean of 18.04 °C (64.5 °F); the frost-free period lasts 265 days.

Winter begins somewhat sunny and dry but becomes progressively wetter and cloudier; spring begins especially gloomy, and from March to June each of the months averages more than 190 mm (7.5 in) of rainfall.