Sitamarhi experiences a subtropical climate with distinct seasonal variations. Winters are mild, with temperatures ranging from 9-24°C in January and December, while springs bring rising temperatures up to 36°C by March. Summer months of April to June see temperatures often reach around 38°C, with slight dips in July and August. Autumn brings a welcome respite, with temperatures gradually decreasing to 22-29°C from September to November. During winters, the temperature drops again, but remains relatively mild compared to other parts of India.