The survival of any species depends on how efficiently it can thrive during unfavourable seasons. Diapause in Sternochaetus mangiferae, a monophagous pest of mango in India and other mango-growing countries of the world, was achieved by it remaining in a dormant phase during its adult stage. The diapause in the weevil was studied based on an extensive survey carried out in pest-infested areas of Kannur and Kozhikode districts of Kerala from the year 2023 to 2024.The mangoes that were collected from the field were cut open to identify the presence of the different immature stages of the pest and studied using a stereo zoom microscope. The pulps of the ripened mangoes were removed to expose the nuts, and 500 nuts were placed in plastic containers with small holes at the bottom and top. The nuts were observed regularly for the emergence of the weevil. Sudden falls in temperature and relative humidity, rainfall, and the onset of flowering in mango trees were recorded regularly to study their effects on the onset of diapause and its termination. The details of the life cycle, including the immature stages, were studied and discussed. This work showed that in Kerala (India), the emergence of the adult from the nut depended on the humidity, fall in temperature, and rainfall. Under the cage conditions, all the adults entered the diapause stage by the second week of July, which was influenced by heavy rainfall, humidity, and a fall in temperature. Meanwhile, the break in diapause was observed to occur along with the flowering of mango. In the study area of of Kerala during the years of 2023 and 2024, the exit from diapause was achieved in the months of January and February of the year 2024. Various factors involved in diapause and its termination are discussed.