Nellikkuppam's climate is characterized by mild winters and hot summers, with temperatures gradually increasing as the year progresses. From January to March, temperatures range from 21-36°C, setting the tone for a warm spring season. As summer sets in, April to June, temperatures soar to an average high of 31°C, with occasional peaks above 40°C. The monsoon season brings little respite, with temperatures remaining relatively stable at around 30°C from July to September. Autumn, spanning October to December, sees a slight drop in temperature, but still averages highs of 26-28°C.