The Study Included the best Climatic Requirements for growing Cotton Including. Temperature - Relative Humidity- Rainfall- Light& Radiations. In agricultural area's in Yemen, like Hodeida, Abyan, Lahj. It's proved that cotton crops need different climatic cases according to the different steps in growth . During time of planting seeds being affected by soil's temperature as well as weather. Of course plants appearing speedily as result of those reasons. So plants growing well in a short time . It's suggested Hodeidh is fit for growing this kind in enough for Lahj even if it's temperature lower 4-7 than it's real one. It's proved that rains in area's where cotton is grown in Yemen according to weather forecast, no enough for growing cotton. Broadly, Irrigation instead of Relative Humidity, Light& Radiations are important for this kind of crops. Hodeida has the second class because of both its extent and production. Abyan and Lahj come after it according to the statistics.

Key Words :Agriculture, Cotton, Requirements, Climatic