Rui'an experiences a subtropical climate with distinct seasonal variations. Winters are mild, with temperatures ranging from near-freezing to warm days in the low teens Celsius, while springs bring rising temperatures and increasing warmth. Summers are hot and humid, with temperatures often soaring into the mid-30s Celsius, although occasional cooler days provide relief. Autumn is a transition period, gradually cooling down after the sweltering summer, while winters start to chill again.