agriculture is deeply affected by climate changes especially in developing countries. Some studies indicated that Wheat yield could be 18% less than usual, and Corn yield could be 19% less than usual in Egypt in case temperature rises one degree. This study aims at measuring the impact of climate change and climate variation on Wheat and Corn yield in Egypt. It used statistical methods and secondary data to achieve study objectives. The results showed that the main climate agricultural zones in Egypt are North Delta, South Delta and Middle Egypt, and Upper Egypt. The results indicated that yield is going down as we head South for both Wheat and Corn, Wheat yield reached 2.95, 2.89, and 2.23 ton/feddan in the three zones respectively, while it reached 3.369, 3.047, and 2.389 ton/feddan respectively for cornThose yield variation were statistically significant, and Egypt society is loosing about L.E 1485 million yearly due to climate variation among climate zone. Hence, the climate effects should be deeply considered by policy makers. Finally the study recommends that more attention should be paid to the negative effects of climate changes, cereal breeders focus more on anti-heat stress varieties, and government should invest more in agricultural research and technology adaptation.