Yong'an, similar to the rest of the province, has a
humid subtropical climate (
Köppen Cfa), with short and mild winters, and long, very hot and humid summers. The monthly 24-hour average temperature ranges from in January to in July, and the annual mean is . Rainfall averages more than per month from March to June before gradually tapering off until early winter. With monthly percent possible sunshine ranging from 23% in March to 55% in July, the city receives 1,629 hours of bright sunshine annually, with summer being the sunniest time of the year; spring and late winter are especially overcast and damp. ==Administrative divisions==