Brown planthopper, Nilaparvata lugens (Stal.) is a major pest of rice during both dry and wet season. Such occurrence made it necessary to know its chances of survival and multiplication ability during the intermediate summer period so that the possible incidence at later stage of crop period can be predicted. It was found that the insect thrived and multiplied well at a temperature of 30 ± 3º C. Eggs hatched after 7 days of egg laying. The freshly emerged nymphs could complete their instar development within 11-14 days to become adults and 52.7% winged forms developed. With the rise in temperature, there was a gradual decrease in the number of eggs laid, the percentage of egg hatching decreased and the incubation period increased. At a temperature regime of 40-42ºC, there was no egg laying.