Sirajganj experiences a warm climate with distinct seasonal variations. Winter is mild, with temperatures ranging from 11-29°C in January and 15-35°C in February, gradually warming up towards the end of winter. Spring brings moderate temperatures, peaking at around 34°C in March. The summer warmth slowly fades as autumn approaches, with November temperatures settling between 17-23°C. Winter returns with temperatures ranging from 15-22°C in December, marking a return to milder conditions.