Forbesganj experiences a subtropical climate with distinct seasons. Winters, spanning from December to February, are cool and temperate, with average temperatures ranging from 16-21°C. As the year progresses into spring, March to May, the temperature rises rapidly, reaching averages of 26-30°C. Summers, June to September, bring scorching heat, with temperatures averaging around 29-36°C. Autumn, October to November, sees a moderate drop in temperature, returning to cooler averages of 23-28°C before winter sets in again.