Yichun has a humid subtropical climate (Köppen Cfa) affected by the East Asian monsoon. Spring begins especially gloomy, and from April to June each of the months averages more than 210 mm (8.3 in) of rainfall.
After the heavy rains subside in June, summer is especially sunny. Autumn is warm and relatively dry.
Autumn is warm and relatively dry.
Winter begins somewhat sunny and dry but becomes progressively wetter and cloudier.