Egypt has been stricken by several extreme weather events during the last decades. The most famous heatwave was during the winter season of 2010 and summer season of 2015. Global climate change will cause serious impacts on agriculture in the future. The aim of this study was to investigate heatwave events during the period from 1980up to 2015 in 3 governorates in Egypt. Major agricultural climatic regions were represented in this study; Behira governorate represents North Delta, Giza governorate represents Middle Egypt and Qena represents Upper Egypt. Monthly Maximum and minimum air temperature were recorded in all governorates during the study period. The highest monthly maximum air temperature was recorded in summer season was in August 2015 followed by August 2012. Qena Governorate had the highest maximum air temperature followed by Giza Governorate while the lowest maximum air temperature was recorded in El-Behira Governorate. The daily maximum air temperature of the highest months was investigated to determine the severe period of heatwaves during these months. On the other hand, the highest extreme heatwaves were recorded in the winter season of 2010. In addition, monthly mean relative humidity percentage was collected for the same concerned governorates. The productivity of two of the major cereal crops in Egypt, during the heat waves events, were estimated during winter as well as summer seasons. The highest reduction of productivity for wheat and maize was recorded in Upper Egypt followed by Middle Egypt; while the lowest reduction was recorded in North Delta for wheat (winter season) and maize (summer season).