The adverse impact of climate change has become a global consensus in recent days. Climate conditions are the main uncontrollable factors affecting crop production and the main driver of fluctuations in global food production. As the temperature is rising in recent days the production of crops is critical to maintain global food supply. But different studies have yielded different results. Crops are sensitive to climate change, including changes in temperature and precipitation, and to rising atmospheric CO2 concentration. This paper discusses about the adverse impact of temperature on food security. It finds that in Kerala rise in temperature become a greater challenge, because it adversely affects the selected crops. So that in the study area food security Is critical and the rise in temperature should be curbed to protect the people from food insecurity.